trill, in phonetics, a vibration or series of flaps (seeflap) of the tongue, lips, or uvula against some other part of the mouth. The Spanish rr in perro (“dog”) is a tongue trill, and the French r is sometimes pronounced as an uvular trill.
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The Editors of Encyclopaedia Britannica. "trill". Encyclopedia Britannica, 20 Jul. 1998, https://www.britannica.com/topic/trill-speech-sound. Accessed 5 April 2025.
