Etymology
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embouchure (n.)

1760, in musical sense "placement of the mouth on a wind instrument," from French embouchure "river mouth, mouth of a wind instrument," from assimilated form of en- "in" (see en- (1)) + bouche "mouth" (see bouche).

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Definitions of embouchure

embouchure (n.)
the aperture of a wind instrument into which the player blows directly;
Synonyms: mouthpiece
From wordnet.princeton.edu