Webster's English Dictionary

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embouchure

em.bou.chure \.a:m-bu.-'shu.(*)r\ n [F, fr. (s')emboucher to flow into, fr. 
   en- + bouche mouth m more at DEBOUCH 1: the position and use of the lips in 
   producing a musical tone on a wind i nstrument 2: the mouthpiece of a 
   musical instrument