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mouth·piece

mouthpiece

 
pronunciation:
maUth pis
features:
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part of speech: noun
definition 1: a part of an object that is put into or near the mouth. Mouthpieces may be used to help pass speech and other sounds from one person to another or to make music.
She blew into the trumpet mouthpiece.
 
definition 2: a rubber or plastic object worn inside the mouth to protect the teeth.
It's important for football players to wear a mouthpiece.
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  instrument, tooth