mouthpiece (
http://definr.com/mouthpiece)
n 1: a part that goes over or into the mouth of a person; "the
mouthpiece of a respirator"
2: an acoustic device; the part of a telephone into which a
person speaks
3: (informal) a spokesperson (as a lawyer) [syn:
mouth]
4: (especially boxing) equipment that protects an athlete's
mouth [syn:
gumshield]
5: the tube of a pipe or cigarette holder that a smoker holds
in the mouth
6: the aperture of a wind instrument into which the player
blows directly [syn:
embouchure]