It's the part of a wind instrument that's called an embouchure
The flat stream of air from the lips, known as the air-reed, breaks against the ... 
about its embouchure are bordered by highly-cultivated fields, in some parts... [DOC] [TLE] Spectral analysis | lefreQue [PAR] The parts that form the piccolo join together and produce interruptions on the 
path ... also called the embouchure, that has a sealing cap with an adjustable 
seal on its .... Gandia (2006) [Acoustic study of wind instruments from Basque 
culture] [DOC] [TLE] Specific orofacial problems experienced by musicians - CiteSeerX [PAR] mouth aperture; brass instruments; and the bagpipes) .... intra-orally with a 
wedge-shaped mouthpiece that has a single bamboo reed attached to its 
underside.