n. In music:n. A tremulous or fluttering effect in vocal music, intended to give a sentimental or passionate quality to the tone, but often carried to a pedantic and offensive extreme.n. A similar effect in instrumental music, produced by a rapid reiteration of a tone or chord.n. A similar effect in organ music, produced in the pipe-organ by means of a delicately balanced bellows attached to one of the wind-trunks, and in the reed-organ by a revolving fan.n. The mechanical device in an organ by which a tremolo is produced; a tremulant. The use of such a mechanism is usually controlled by a stop-knob. Also tremolant, tremulant.