orthognathism

noun

or·​thog·​na·​thism ȯr-ˈthäg-nə-ˌthiz-əm 

variants or orthognathy

-nə-thē 

plural orthognathisms or orthognathies

: the quality or state of not having the lower parts of the face projecting

orthognathous

-nə-thəs 

adjective