sídh

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Solar system illustration. (planets; sun)

Why Are Planets Round?

Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.

Is Earth Going to Change the Direction in Which It Rotates?

Solar system illustration. (Sun; planets)

A Model of the Cosmos

African American man praying in church with stained glass in background

Why Do People Say “Amen” at the End of a Prayer?

Paleogeography and paleoceanography of Early Triassic time. The present-day coastlines and tectonic boundaries of the configured continents are shown at the lower right. Continents, continental drift, plate tectonics, Pangea, Laurussia, Gondwana.

Spotting a Supercontinent: How Pangea Was Discovered

Discover

The Battle of Gettysburg, July 1-3, 1863. (Civil War, Pennsylvania)

9 Worst Generals in History

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Gills of three old specimens of webcap fungus (Cortinarius) in Gloucestershire, South West England. toxic, fungi, poisonous mushroom

7 of the World’s Most Poisonous Mushrooms

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.

What If the President Is Impeached?

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

sídh

Irish folklore

Also known as: síthe

Written and fact-checked by The Editors of Encyclopaedia Britannica

Article History

Also spelled:: síthe

Related Topics:: myth; fairy; hill

sídh, in Irish folklore, a hill or mound under which fairies live. The phrase aos sídhe or the plural sídhe on its own (sometimes anglicized as shee) can denote fairy folk collectively. See also banshee.