orthognathism

noun
or·​thog·​na·​thism | \ȯr-ˈthäg-nə-ˌthiz-əm \
variants: or orthognathy \-​nə-​thē \
plural orthognathisms or orthognathies

Medical Definition of orthognathism 

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

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