1640s, from Italian trillio, triglio "a quavering or warbling in singing," probably ultimately of imitative origin. The verb is 1660s, from Italian trillare "to quaver, trill." Related: Trilled; trilling.
Some speakers trill their r's
he pronounced his R's with a distinct trill
trike
trilateral
trilby
trilemma
trilingual
trill
trillion
trillionth
trillium
trilobite
trilogy
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