Etymology
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tremolo (n.)

"tremulous effect in music," 1801, from Italian tremolo, from Latin tremulus "trembling" (see tremulous).

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Definitions of tremolo

tremolo (n.)
(music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones;
tremolo (n.)
vocal vibrato especially an excessive or poorly controlled one;
From wordnet.princeton.edu