embouchure
/ˌɑ̃.bu.ʃyʁ/ or /ɑ̃.buˈʃʊər/Definitions
1. noun
The position and shape of a musician’s lips, facial muscles, and jaw, particularly as it relates to the formation of a sound on a brass instrument such as a trumpet, trombone, or French horn.
“The musician’s embouchure was unique in that it allowed her to produce a rich, full tone on the trumpet.”