ˈ ̷ ̷ˌ ̷ ̷ noun
1. : a structure or appendage that serves as a mouth
mouthpiece of a reed organ pipe
specifically : an appendage to an inlet or outlet of a pipe or container that controls the flow of a fluid or other material (as of coal into a coal gas retort)
2.
a. : a part that goes in the mouth
mouthpiece of a respirator
mouthpiece of a saxophone
mouthpiece of a briar pipe
the entire action of the bit should be concentrated in the mouthpiece — W.H.Carter
specifically : a cigar or cigarette holder
b. : a part to which the mouth is applied
mouthpiece of a trumpet
mouthpiece of a telephone
c. : a protective device for the mouth ; specifically : a guard worn in the mouth over the upper teeth by a boxer to protect the teeth and reduce the hazard of cut lips
3.
a. : one that expresses or interprets another's views
accept her as the conventional mouthpiece for all the discontents the author wishes to discharge — G.J.Becker
government, as the mouthpiece and executive instrument of the people — A.J.Bruwer
specifically : an official spokesman
his assistants, mouthpieces, and messengers … carried out his orders — S.G.Morley
virtually every newspaper was the bought-and-paid-for mouthpiece of a party or clique — W.A.Swanberg
could create the sense in all who listened to him that he was the mouthpiece of destiny — J.H.Plumb
b. slang : criminal lawyer