trem·o·lo ˈtreməˌlō/ noun Music noun: tremolo; plural noun: tremolos a wavering effect in a musical tone, typically produced by rapid reiteration of a note, or sometimes by rapid repeated variation in the pitch of a note or by sounding two notes of slightly different pitches to produce prominent overtones. a mechanism in an organ producing a tremolo. a lever on an electric guitar producing a tremolo. noun: tremolo arm; plural noun: tremolo arms