Gaius Petronius Arbiter: The Satyricon.: …realism and the figure of Trimalchio. It is obvious that the table talk of the guests in the “Banquet” is based on the author’s personal observation of provincial societies. The speakers are beautifully and exactly characterized and their dialogue, quite apart from the invaluable evidence for colloquial Latin afforded by…

trimaran, three-hulled variant of the catamaran

protozoan: Annotated classification: Trimastix Free-living quadriflagellates with a broad cytostome containing a posterior-directed flagellum; mitochondria are replaced by small, dense organelles. Jakobida Although not a unique characteristic, all jakobids possess tubular mitochondrial cristae and a multilayered structure associated with basal bodies. The jakobic

David Trimble was a politician who served as first minister of the Northern Ireland Assembly (1998–2002), leader of the Ulster Unionist Party (UUP; 1995–2005), and a member of the British Parliament (1990–2005). In 1998 Trimble and John Hume, leader of the Social Democratic and Labour Party (SDLP),

Robert Trimble was an associate justice of the United States Supreme Court (1826–28). Trimble grew up on the Kentucky frontier and studied law privately, being admitted to the bar in 1803. In 1807 he was appointed a judge of the Court of Appeals, but after two years he returned to private practice,

David Trimble was a politician who served as first minister of the Northern Ireland Assembly (1998–2002), leader of the Ulster Unionist Party (UUP; 1995–2005), and a member of the British Parliament (1990–2005). In 1998 Trimble and John Hume, leader of the Social Democratic and Labour Party (SDLP),

Laurence Housman: …was dominant in the novel Trimblerigg (1924), of which David Lloyd George was the thinly disguised butt.

magnoliid clade: Reproductive structures: …are not fundamentally different, for Trimenia (Laurales) has pollen that is inaperturate, polyforate, or disulculate (a biaperturate type). Such forms would have evolved from one to another many times over.

fer-de-lance: The Okinawa habu (T. flavoviridis) is a large, aggressive snake found on the Amami and Okinawa island chains in the Ryukyu Islands, often in human dwellings. It is usually about 1.5 metres (5 feet) long and is marked with bold, dark green blotches that may merge…

amphibian: Annotated classification: †Superfamily Trimerorhachoidea (trimerorhachoids) Upper Mississippian to Upper Permian. Flattened skull, shortened preorbital and elongate postorbital regions; palatal openings enlarged. †Clade Eryopoidea (eryopoids) Upper Mississippian to Late Permian. Flattened skull, long preorbital and shortened postorbital

prosody: Syllable-stress metres: …of two dimeter, of three trimeter, of five pentameter, of six hexameter, and of seven heptameter. Lines containing more than seven feet rarely occur in English poetry.

cholinergic drug: …latter group includes hexamethonium and trimethaphan. These drugs cause overall paralysis of the autonomic nervous system because they do not distinguish between sympathetic and parasympathetic ganglia and therefore are not specific in their action. They were the first effective agents to reduce high blood pressure (antihypertensive drugs), but they have…

epitaxy: …uses metal-organic species such as trimethyl gallium (which are usually liquid at room temperature) as a source for one of the elements. For example, trimethyl gallium and arsine are often used for epitaxial gallium arsenide growth. Chemical beam epitaxy uses a gas as one of its sources in a system…

organosulfur compound: Sulfonium and oxosulfonium salts; sulfur ylides: …as in the case of trimethyl oxosulfonium chloride, [(CH3)3S=O]+Cl−, converted from dimethyl sulfoxide and methyl chloride. Like sulfoxides, sulfonium and oxosulfonium salts are chiral and can be isolated in optically active form if the attached carbon groups are all different, as in RR′R″S+ and RR′R″S(=O)+. The first known optically active…

organosulfur compound: Sulfonium and oxosulfonium salts; sulfur ylides: …as in the case of trimethyl sulfonium bromide, (CH3)3S+Br−, formed from dimethyl sulfide and methyl bromide. The sulfonium salts are named by putting the names of the several alkyl groups before “sulfonium halide.” Similarly, sulfoxides can be converted into the corresponding oxosulfonium salts, as in the case of trimethyl oxosulfonium…

organometallic compound: Defining characteristics: …of an organometallic compound is trimethylboron, B(CH3)3, which contains three B―C bonds.

butyl alcohol: …butyl alcohol, isobutyl alcohol, and tertiary (t-) butyl alcohol.

cyclopropane, explosive, colourless gas used in medicine since 1934 as a general anesthetic. Cyclopropane is nonirritating to mucous membranes and does not depress respiration. Induction of and emergence from cyclopropane anesthesia are usually rapid and smooth. A mixture of about 5 to 20 percent

caffeine, nitrogenous organic compound of the alkaloid group, substances that have marked physiological effects. Caffeine occurs in tea, coffee, guarana, maté, kola nuts, and cacao. Pure caffeine (trimethylxanthine) occurs as a white powder or as silky needles, which melt at 238 °C (460 °F); it

map: World War II and after: …what became known as the trimetrogon method, was developed. Vast areas of the unmapped parts of the world were covered during the war years, and the resulting World Aeronautical Charts have provided generalized information for other purposes since that time. Many countries have used the basic data to publish temporary…

O. Henry: …The Four Million (1906) and The Trimmed Lamp (1907) explored the lives of the multitude of New York in their daily routines and searchings for romance and adventure, and the former contained the widely popular story “The Gift of the Magi.” Heart of the West (1907) presented accurate and fascinating…

children’s literature: From T.W. to Alice (1712?–1865): Sarah Kirby Trimmer, whose Fabulous Histories specialized in piety, opposed the presumably free-thinking Rousseau on religious grounds but was in other respects strongly influenced by him. The same is true of Anna Laetitia Barbauld, with her characteristically titled Lessons for Children. But Mary Martha Sherwood…

Indus River: Irrigation of the Indus River: …feeds the Haveli Canal and Trimmu-Sidhnai-Mailsi-Bahawal link canal systems, which provide irrigation to areas in southern Punjab province.

Plovdiv, second largest city of Bulgaria, situated in the south-central part of the country. It lies along the Maritsa River and is situated amid six hills that rise from the Thracian Plain to a height of 400 feet (120 metres). Called Pulpudeva in Thracian times, it was renamed Philippopolis in 341

Trimurti, in Hinduism, triad of the three gods Brahma, Vishnu, and Shiva. The concept was known at least by the time of Kalidasa’s poem Kumarasambhava (“Birth of the War God”; c. 4th–5th century ce). The Trimurti collapses the three gods into a single form with three faces. Each god is in charge of

Elephanta Island: …is the 20-foot- (6-metre-) high trimurti Sadashiva, a three-headed bust of Shiva in the roles of destroyer, preserver, and creator emerging from a mountain. Other sculptures depict Shiva crushing Ravana with his toe, the marriage of Shiva and Parvati, Shiva bringing the Ganges (Ganga) River to earth by letting it…

Palermo: …the founding of the Norman kingdom of Sicily in 1130 by Roger II. Palermo became the capital of this kingdom, in which Greeks, Arabs, Jews, and Normans worked together with singular harmony to create a cosmopolitan culture of remarkable vitality.

West Bengal: History of West Bengal: …the All India Trinamool (or Trinamul) Congress (AITC), had been an ally in what was then the Congress Party’s national ruling coalition government. The AITC’s founder and leader, Mamata Banerjee, became the state’s first female chief minister (head of government).

West Bengal: History of West Bengal: …the All India Trinamool (or Trinamul) Congress (AITC), had been an ally in what was then the Congress Party’s national ruling coalition government. The AITC’s founder and leader, Mamata Banerjee, became the state’s first female chief minister (head of government).

Posadas, city, capital of Misiones provincia (province), northeastern Argentina. Situated in the western corner of the province, it is bordered (north and east) by the Paraná River, which separates it from Encarnación, Paraguay. The settlement originated as a Paraguayan trading post and river port,

Posadas, city, capital of Misiones provincia (province), northeastern Argentina. Situated in the western corner of the province, it is bordered (north and east) by the Paraná River, which separates it from Encarnación, Paraguay. The settlement originated as a Paraguayan trading post and river port,

bullfighting: Act three: Other maneuvers include the trincherazo, typically done with one knee on the ground and at the beginning of the faena, and the pase de la firma, in which the muleta is moved in front of the bull’s nose while the bullfighter remains motionless. Especially noteworthy is the left-handed natural,…

Trincomalee, town and port, Sri Lanka, on the island’s northeastern coast. It is situated on a peninsula in Trincomalee Bay—formerly called Koddiyar (meaning “Fort by the River”) Bay—one of the world’s finest natural harbors. Trincomalee was in early times a major settlement of Indo-Aryan

Trincomalee: …situated on a peninsula in Trincomalee Bay—formerly called Koddiyar (meaning “Fort by the River”) Bay—one of the world’s finest natural harbors.

Battle of Trincomalee, savage naval battle that occurred on September 3, 1782, during the Anglo-French War (1778–83). It was fought off the coast of Trincomalee, northeastern Sri Lanka, famous throughout history as one of the finest ports in the world. In 1778, France took the side of the Americans

José Trindade Coelho was a Portuguese writer who is best known for his regional short stories, most of which are set in remote, rural northern Portugal. Trindade Coelho graduated in 1885 from the University of Coimbra and subsequently entered the government legal service. He was a magistrate in

hogchoker, North American fish, a species of sole

Tringa, genus of shorebirds in the family Scolopacidae (order Charadriiformes). Its members include the birds known as greenshank, redshank, sandpiper, and yellowlegs

redshank: The slightly larger spotted redshank (T. erythropus), also called dusky or black redshank, has reddish brown legs and a straight red bill with a brown tip. In breeding season, its plumage is black; in winter, gray. It breeds across sub-Arctic Eurasia and winters from the Mediterranean region into…

yellowlegs: The lesser yellowlegs (T. flavipes), about 25 cm (10 inches) long, appears in sizable flocks on mud flats during migration between its breeding grounds across Canada and Alaska and its wintering ground from the Gulf of Mexico to southern Chile and Argentina. The greater yellowlegs (T.…

sandpiper: The common sandpiper (Actitis, or sometimes Tringa, hypoleucos) is an abundant breeder on grassy shores of lakes and rivers throughout Eurasia, and it winters from Africa to Australia and Polynesia. This species is notable for a nervous mannerism of wagging its tail. The closely related spotted…

yellowlegs: The greater yellowlegs (T. melanoleuca), about 35 cm (14 inches) long, with a proportionately longer and stouter (and slightly upturned) bill, has similar breeding and wintering ranges but is everywhere less common and more wary than the lesser yellowlegs. Individuals of the two species may be…

greenshank, (species Tringa nebularia), Old World shorebird of the family Scolopacidae (order Charadriiformes). Greenshanks are gray birds with greenish legs and a white rump. Rather slender, about 30 cm (12 inches) long, they are deep waders and have a long, slightly upturned bill. Greenshanks

sandpiper: The closely related green sandpiper (T. ochropus) is its slightly larger counterpart in boreal and mountainous regions of Eurasia.

sandpiper: The solitary sandpiper (Tringa solitaria), which breeds in North America and winters in South America, is unusual in nesting not on the ground but in the old tree nests of other birds. The closely related green sandpiper (T. ochropus) is its slightly larger counterpart in boreal…

redshank: In the common redshank (Tringa totanus), about 30 cm (12 inches) long, the legs are orange-red, the upper parts are brownish or gray, the rump and hind edge of the wing are white, and the upturned bill is reddish with a black tip. The common redshank nests…

tattler, any shorebird that is easily alarmed and calls loudly when it senses danger. Broadly, tattlers are birds of the subfamily Tringinae of the family Scolopacidae. Examples are the redshank, greenshank, willet, and yellowlegs. More narrowly, the name is given to the wandering tattler

Trinh Family, noble family that dominated northern Vietnam during much of the Later Le dynasty (1428–1788); it gained control of the position of regent to the Le rulers in the middle of the 16th century. Thereafter, the successive Le monarchs were rulers in name only. From about 1600 onward, Trinh

Trinidad, city, seat (1866) of Las Animas county, south-central Colorado, U.S., situated on the Purgatoire River in the foothills of the Sangre de Cristo Mountains at an elevation of 6,025 feet (1,836 metres), south of Pueblo. Near the foot of Raton Pass (12 miles [19 km] south on the Colorado–New

Trinidad, city, south-central Uruguay. It lies in the Porongos Hills, a northern outlier of the Grande Inferior Range. The city is the area’s principal trade and manufacturing centre. Wheat, corn (maize), linseed, oats, and fruit grown in the hinterland are processed in Trinidad. Dairying,

Trinidad, city, central Cuba. It lies on the southern slopes of the Sierra de Trinidad, north of its Caribbean Sea port, Casilda. Trinidad was founded in 1514 by Diego Velázquez de Cuéllar. It prospered during the colonial era and for some time was Cuba’s wealthiest city. To preserve the colonial

Trinidad, city, northeastern Bolivia. It lies in the Moxos (Mojos) Plains, an ancient lake bed stretching eastward from the foothills of the Andean eastern cordillera. In 1686 Jesuits led by Father Cipriano Barrace founded a mission at the present site of the city, naming it Trinidad (“Trinity”)

steel band: …formation in 1950 of the Trinidad All Steel Percussion Orchestra (TASPO), a government-sponsored ensemble that brought together prominent players from different neighbourhood bands. Most of the musicians were well-known pan tuners, including Ellie Mannette of the band Invaders, Anthony Williams of North Stars, and others. The TASPO members enjoyed productive…

Trinidad and Tobago, island country of the southeastern West Indies. It consists of two main islands—Trinidad and Tobago—and several smaller islands. Forming the two southernmost links in the Caribbean chain, Trinidad and Tobago lie close to the continent of South America, northeast of Venezuela

national flag consisting of a red field (background) incorporating a diagonal black stripe with white fimbriations (narrow borders). The flag has a width-to-length ratio of 3 to 5.As a British colony, Trinidad and Tobago displayed both the Union Jack and the British Blue Ensign with a special

history of Trinidad and Tobago, a survey of notable events and people in the history of Trinidad and Tobago. Located in the southeastern West Indies, the country consists of two main islands—Trinidad and Tobago—and several smaller islands. Trinidad and Tobago lie close to the continent of South

Trinidad and Tobago, island country of the southeastern West Indies. It consists of two main islands—Trinidad and Tobago—and several smaller islands. Forming the two southernmost links in the Caribbean chain, Trinidad and Tobago lie close to the continent of South America, northeast of Venezuela

boxing: Latin America: …Carlos Ortiz, Wilfredo Gómez, and Félix Trinidad of Puerto Rico; and Kid Gavilan, Kid Chocolate, Luis Rodríguez, and José Napoles of Cuba. With the advent of communist rule in Cuba in 1959, professional boxing was banned there. However, Cuba has since become the world’s preeminent nation in amateur boxing, in…

Java: History: The site of Trinil on Java is famous for the discovery in 1891 of fossilized remains of Homo erectus, or “Java man,” which indicates that the island was the site of human activity perhaps as early as 1.5 million years ago. The colonization of Java apparently took place…

Homo erectus: The earliest finds: …well-preserved skullcap was unearthed at Trinil on the Solo River. Considering its prominent browridges, retreating forehead, and angled rear skull, Dubois concluded that the Trinil cranium showed anatomic features intermediate between those of humans (as they were then understood) and those of apes. Several years later, near where the skull…

Rome: Piazza di Spagna: …French-built church and convent of Trinità dei Monti, begun in 1495 with a gift from the visiting French king Charles VIII and restored by Louis XVIII.

flag of the Dominican Republic: …Dominican revolutionary group known as La Trinitaria emphasized its Christian heritage by placing a white cross on the background of the blue-red flag. The revolution led by La Trinitaria broke out on February 27, 1844, and the flag, designed by Juan Pablo Duarte, was hoisted the next day. The success…

Trinitarian, member of the Order of the Most Holy Trinity for the Redemption of Captives (O.SS.T.), a Roman Catholic religious order that was founded in France in 1198 by St. John of Matha. The order’s original mission was to free enslaved Christians from captivity under the Moors in the Middle

Christianity: Conflict between order and charismatic freedom: ” In his work De Trinitate (“On the Trinity”), Augustine undertook to render the essence of the Trinity understandable in terms of the Trinitarian structure of the human person: the Holy Spirit appears as the Spirit of love, which joins Father and Son and draws people into this communion…

Caen: …churches of Saint-Étienne (the Abbaye-aux-Hommes) La Trinité (the Abbaye-aux-Dames) escaped war damage; both date from the 1060s and are fine specimens of Norman Romanesque. William the Conqueror’s tomb is in front of Saint-Étienne’s high altar, and the tomb of his wife, Matilda, stands in La Trinité’s choir. William’s remains were…

nitrocellulose: Composition, properties, and manufacture of nitrocellulose: …be replaced, resulting in cellulose trinitrate, which contains more than 14 percent nitrogen. In practice, however, most nitrocellulose compounds are dinitrates, averaging 1.8 to 2.8 nitro groups per molecule and containing from 10.5 to 13.5 percent nitrogen. The degree of nitration determines the solubility and flammability of the final product.

television: Shadow masks and aperture grilles: …introduced in the Sony Corporation’s Trinitron tube. In Trinitron-type tubes the shadow-mask is replaced by a metal grille having short vertical slots extending from the top to the bottom of the screen (see the figure). The three electron beams pass through the slots to the coloured phosphors, which are in…

trinitrotoluene (TNT), a pale yellow, solid organic nitrogen compound used chiefly as an explosive, prepared by stepwise nitration of toluene. Because TNT melts at 82° C (178° F) and does not explode below 240° C (464° F), it can be melted in steam-heated vessels and poured into casings. It is

explosive: TNT: …a mixture of 40 percent trinitroxylene (TNX) and 60 percent TNT. This mixture not only casts perfectly but can be detonated with a smaller tetryl booster. There is no indication that any TNX was used in World War II; it is believed to have been replaced by PETN and RDX.

Titian: Religious paintings: The Trinity (or La Gloria), painted for Charles V’s personal devotion, reflects central Italian art to a lesser degree than the earlier Christ Crowned with Thorns. The glowing richness of color predominates in this adoration of the Trinity in which Charles V and his family appear…

El Greco: Middle years: …in the painting of the Trinity, in the upper part of the high altar, where the powerful sculpturesque body of the nude Christ leaves no doubt of the ultimate source of inspiration. In the lateral altar painting of the Resurrection, the poses of the standing soldiers and the contrapposto (a…

Trinity, in Christian doctrine, the unity of Father, Son, and Holy Spirit as three persons in one Godhead. The doctrine of the Trinity is considered to be one of the central Christian affirmations about God. It is rooted in the fact that God came to meet Christians in a threefold figure: (1) as

Hanford Site: …on July 16, 1945 (the Trinity test), and the bomb (called Fat Man) that effectively ended the war when it was detonated over Nagasaki, Japan, on August 9. (The Hiroshima bomb was fueled by uranium-235 from the Oak Ridge, Tennessee, nuclear facility.)

Leon Uris: …dealing with Nazi war crimes; Trinity (1976), a chronicle of a Northern Irish farm family from the 1840s to 1916; The Haj (1984), depicting the lives of Palestinian Arabs from World War I to the Suez war of 1956; and A God in Ruins (1999), a novel about a U.S.…

Western architecture: United States: …Gothic church; but it was Trinity Church (1839–46) at New York City, in a flat, harsh Gothic style, that established his reputation. This was built for the Episcopalians and was rigidly “correct” in the ecclesiological sense. During the next 30 years he designed no fewer than 40 Gothic churches, mostly…

H.H. Richardson: …the Brattle Square (1870–72) and Trinity (1872–77) churches in Boston. Designed for the renowned preacher Phillips Brooks, Trinity was one of the most important Episcopal churches in America. Richardson’s Romanesque revival design won him a national reputation, many imitators, and so many New England commissions that it became desirable to…

Bloomsbury group: …the group had been at Trinity or King’s College, Cambridge, with Leslie Stephen’s son Thoby, who had introduced them to his sisters Vanessa and Virginia. Most of them had been “Apostles”; i.e., members of the “society,” a select, semisecret university club for the discussion of serious questions, founded at Cambridge…

Trinity College, private, coeducational institution of higher learning in Hartford, Conn., U.S. It is a nonsectarian liberal arts college that has a historical affiliation with the Episcopal church. It offers B.A. and B.S. degrees in about 35 majors and M.A. and M.S. degrees in five departments.

Duke University, private coeducational institution of higher learning in Durham, North Carolina, U.S., affiliated with but not controlled by the United Methodist Church. In 1838 a regular program of education was initiated at a schoolhouse in Randolph county, to the west of Durham, and a year later

Trinity College Dublin, the oldest university in Ireland, founded in 1592 by Queen Elizabeth I of England and Ireland and endowed by the city of Dublin. The two names of the school—the University of Dublin and Trinity College Dublin—are used interchangeably, though there are legal and other

lighthouse: The beginning of the modern era: Douglass, engineer-in-chief of Trinity House. In order to reduce the tendency of waves to break over the lantern during severe storms (a problem often encountered with Smeaton’s tower), Douglass had the new tower built on a massive cylindrical base that absorbed some of the energy of incoming seas.…

Rhode Island: Cultural institutions: The Trinity Repertory Company (1964), with its own home in Providence, is renowned for producing works by new playwrights as well as for staging novel productions of classic works.

Feast of the Holy Trinity, Christian feast in honour of the Trinity, celebrated in Western liturgical churches on the Sunday following Pentecost (the 50th day after Easter). It is known that the feast was celebrated on this day from as early as the 10th century. Celebration of the feast gradually

Moscow: The Kremlin of Moscow: …two other principal gate towers—the Trinity (Troitskaya) Tower, with a bridge and outer barbican (the Kutafya Tower), and the Borovitskaya Tower—rise from the western wall.

Fécamp: The abbey of the Trinity, which was destroyed by lightning, was rebuilt between the 12th and 13th centuries and was restored in the 15th and 18th centuries. It is an impressive building with a lantern tower 275 feet (84 metres) high. There is also a distillery…

Christianity: Conflict between order and charismatic freedom: ” In his work De Trinitate (“On the Trinity”), Augustine undertook to render the essence of the Trinity understandable in terms of the Trinitarian structure of the human person: the Holy Spirit appears as the Spirit of love, which joins Father and Son and draws people into this communion…

Russian Orthodox Church: …foremost religious centre by the Trinity–St. Sergius monastery, which was founded in the mid-14th century by St. Sergius of Radonezh (in what is now the city of Sergiyev Posad). Sergius, as well as the metropolitans St. Peter (1308–26) and St. Alexius (1354–78), supported the rising power of the principality of…

drinking song, song on a convivial theme composed usually for singing in accompaniment to drinking. The form became a standard element in certain types of 19th-century opera and operetta, frequently involving not only a soloist but also a chorus joining in with choral repeats or refrains. In Italy

Trinovantes, ancient British tribe that inhabited the region that became Essex. In the mid-50s bc their prince, Mandubracius, was driven into exile by Cassivellaunus, king of the aggressive Catuvellauni. Caesar’s second invasion of Britain was going poorly in 54 bc, when the Trinovantes joined him

Trinovantes, ancient British tribe that inhabited the region that became Essex. In the mid-50s bc their prince, Mandubracius, was driven into exile by Cassivellaunus, king of the aggressive Catuvellauni. Caesar’s second invasion of Britain was going poorly in 54 bc, when the Trinovantes joined him

Jean-Louis Trintignant was a French motion-picture actor who achieved a wide range of characterizations with great economy. Trintignant initially studied law but began acting on the stage in 1951. His first film appearance was in Si tous les gars du monde (1955; If All the Guys in the World), and

codon, in genetics, any of 64 different sequences of three adjacent nucleotides in DNA that either encodes information for the production of a specific amino acid or serves as a stop signal to terminate translation (protein synthesis). Codons are made up of any triplet combination of the four

trio, a musical composition for three instruments or voices, or a group of three performers. The term trio came to be identified with the middle section of a dance movement in ternary form (the b section of an aba form such as a minuet or a scherzo). The designation arose because many such trio

Linda Ronstadt: and Emmylou Harris resulted in Trio (1987), followed by Trio II (1999), which included the Grammy Award-winning single “After the Gold Rush.” Her album of children’s songs, Dedicated to the One I Love, also won a Grammy, in 1996. Ronstadt’s subsequent releases included the jazz album Hummin’ to Myself (2004)…

Yvonne Rainer: Her best-known dance, “Trio A,” (1966) a section of a larger work called The Mind Is a Muscle (1966–68), consisted of a simultaneous performance by three dancers that included a difficult series of circular and spiral movements. It was widely adapted and interpreted by other choreographers. Rainer choreographed…

trio sonata, major chamber-music genre in the Baroque era (c. 1600–c. 1750), written in three parts: two top parts played by violins or other high melody instruments, and a basso continuo part played by a cello. The trio sonata was actually performed by four instruments, since the cello was

clay mineral: General features: …of octahedral sheet is called trioctahedral, and the latter dioctahedral. If all the anion groups are hydroxyl ions in the compositions of octahedral sheets, the resulting sheets may be expressed by M2+(OH)2 and M3+(OH)3, respectively. Such sheets, called hydroxide sheets, occur singly, alternating with silicate layers in some clay minerals.…

triode, electron tube consisting of three electrodes—cathode filament, anode plate, and control grid—mounted in an evacuated metal or glass container. It has been used as an amplifier for both audio and radio signals, as an oscillator, and in electronic circuits. Currently, small glass triodes are

triode, electron tube consisting of three electrodes—cathode filament, anode plate, and control grid—mounted in an evacuated metal or glass container. It has been used as an amplifier for both audio and radio signals, as an oscillator, and in electronic circuits. Currently, small glass triodes are

savanna: Flora: The prickly spinifex grasses (Plectrachne, Triodia) are prominent in more-arid regions. Most trees and shrubs of the Australian savanna are markedly sclerophyllous. Small patches of monsoon rainforest and other types of vegetation occur locally within mainly savanna regions, surviving in places that have some degree of protection from the dry-season…