Quick, wavering sounds made by rapidly repeating a note or sound, often used in music or bird calls.
From Italian 'trillo,' possibly related to Old Norse 'trill' meaning 'to turn or whirl.' The term entered music vocabulary in the 1600s to describe the ornamental effect.
Bird trills are so distinct that ornithologists use them to identify species in the dark—and Baroque composers like Bach deliberately imitated bird calls, blurring the line between nature and human musical invention.
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