Mouth"piece` (?), n.

1.

The part of a musical or other instrument to which the mouth is applied in using it; as, the mouthpiece of a bugle, or of a tobacco pipe.

2.

An appendage to an inlet or outlet opening of a pipe or vessel, to direct or facilitate the inflow or outflow of a fluid.

3.

One who delivers the opinion of others or of another; a spokesman; as, the mouthpiece of his party.

Egmont was imprudent enough to make himself the mouthpiece of their remonstrance. Motley.

© Webster 1913.