prognathous

adjective prog·na·thous \ ˈpräg-nə-thəs \

Definition of prognathous

: being or having a jaw and typically a lower jaw that projects forward especially to an unusual degree
  • The umpire, a veteran of dim visage with a cigarette jutting out from his prognathous jaw, was diligent about sweeping the plate, but his strike zone tended to bounce.
  • —Richard Conniff
  • a prognathous fish

First Known Use of prognathous

1836

in the meaning defined above

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Medical Dictionary

prognathous

adjective prog·na·thous \ ˈpräg-nə-thəs \

medical Definition of prognathous

: being or having an upper or lower jaw that projects abnormally forward

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