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: 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}]
Source: WordNet® 2.0