Definition from Wiktionary, the free dictionary
See also tremolò
tremolo (plural tremolos)
- (music) A rapid repetition of the same note, or an alternation between two or more notes. It can also be intended to mean a rapid and repetitive variation in pitch for the duration of a note. It is notated by a strong diagonal bar across the note stem, or a detached bar for a set of notes (or stemless notes).
See also 
- First-person singular present indicative form of tremolar.
tremolo (plural tremoli)
- first-person singular present indicative of tremolare