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say it: MOWTH-pees
mouthpiece is a noun meaning "a part that goes over or into the mouth of a person". It carries 6 recorded senses.
a part that goes over or into the mouth of a person
“the mouthpiece of a respirator”
an acoustic device; the part of a telephone into which a person speaks
a spokesperson (as a lawyer)
colloquialism
(especially boxing) equipment that protects an athlete's mouth
boxing
the tube of a pipe or cigarette holder that a smoker holds in the mouth
the aperture of a wind instrument into which the player blows directly
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for mouthpiece come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.