'Mouthpiece' definitions:

Definition of 'mouthpiece'

(from WordNet)
noun
A part that goes over or into the mouth of a person; "the mouthpiece of a respirator"
noun
An acoustic device; the part of a telephone into which a person speaks
noun
A spokesperson (as a lawyer) [syn: mouthpiece, mouth]
noun
(especially boxing) equipment that protects an athlete's mouth [syn: mouthpiece, gumshield]
noun
The tube of a pipe or cigarette holder that a smoker holds in the mouth
noun
The aperture of a wind instrument into which the player blows directly [syn: mouthpiece, embouchure]

Definition of 'Mouthpiece'

From: GCIDE
  • Mouthpiece \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. [1913 Webster]
  • 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. [1913 Webster]
  • 3. One who delivers the opinion of others or of another; a spokesman; as, the mouthpiece of his party. [1913 Webster]
  • Egmont was imprudent enough to make himself the mouthpiece of their remonstrance. --Motley. [1913 Webster]
  • 4. Hence: A person's lawyer. [slang]
  • Note: This is a term that was used sometimes in old movies. When a tough bad guy was arrested he might say "I ain't sayin' nothin' without my mouthpiece!" [PJC]

Synonyms of 'mouthpiece'

From: Moby Thesaurus