Embouchure

n. estuary, mouth of a river; (Music) position of the lips and jaws and lower facial muscles when playing a wind instrument; mouthpiece of wind musical instruments

The embouchure is the use of facial muscles and the shaping of the lips to the mouthpiece of a wind instrument. Less frequently, it is used to mean the mouthpiece itself. The word is of French origin and is related to the root bouche (fr.), 'mouth'.The proper embouchure allows the instrumentalist to play the instrument at its full range with a full, clear tone and without strain or damage to one's muscles.
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Noun
1. the aperture of a wind instrument into which the player blows directly
(synonym) mouthpiece
(hypernym) aperture
(part-holonym) wind instrument, wind

n. mouth, mouthpiece, embouchure; outlet, scoop, outfall

n. embouchure, estuary, mouth of a river