Definitions of mouthpiece

1. ( especially boxing) equipment that protects an athlete's mouth

2. ( informal) a spokesperson ( as a lawyer)

3. an acoustic device; the part of a telephone into which a person speaks

4. a part that goes over or into the mouth of a person; " the mouthpiece of a respirator"

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

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

7. That part of an instrument which is held in, or applied to, the mouth; as, the mouthpiece of a cornet; one who speaks for others.

8. The piece of a musical instrument for the mouth: one who speaks for others.

9. Part of any instrument that is placed in or against the mouth; spokesman.

10. That part of any instrument that is applied to the mouth.

11. A spokesman.

12. In a wind- instrument of music, the piece for the mouth; one who utters opinions on behalf of others; a spokesman: to make mouths, to make grimaces or wry faces: down in the mouth, mortified; dejected: to stop the mouth, to silence or confound.