tremolo

A tremulous effect produced by rapid repetition of a single tone or by rapid alternation of two tones.

A device on an organ for producing a tremulous effect.

Vibrato, especially in singing.

In music:

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.

A similar effect in instrumental music, produced by a rapid reiteration of a tone or chord.

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.

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.

The rapid reiteration of tones without any apparent cessation, so as to produce a tremulous effect.

A certain contrivance in an organ, which causes the notes to sound with rapid pulses or beats, producing a tremulous effect; — called also tremolant, and tremulant.