Etymology
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mouthpiece (n.)

also mouth-piece, 1680s, "casting fitted on an open end of a pipe, etc.," from mouth (n.) + piece (n.1). Meaning "piece of a musical instrument that goes in the mouth" is from 1776. Sense of "one who speaks on behalf of others" is from 1805; in the specific sense of "lawyer" it is attested by 1857.

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Definitions of mouthpiece

mouthpiece (n.)
a part that goes over or into the mouth of a person;
the mouthpiece of a respirator
mouthpiece (n.)
an acoustic device; the part of a telephone into which a person speaks;
mouthpiece (n.)
a spokesperson (as a lawyer);
Synonyms: mouth
mouthpiece (n.)
(especially boxing) equipment that protects an athlete's mouth;
Synonyms: gumshield
mouthpiece (n.)
the tube of a pipe or cigarette holder that a smoker holds in the mouth;
mouthpiece (n.)
the aperture of a wind instrument into which the player blows directly;
Synonyms: embouchure
From wordnet.princeton.edu