From Longman Dictionary of Contemporary Englishprognathousprog‧na‧thous /prɒɡˈneɪθəs $ prɑːɡ-/ adjective technical HBHhaving a jaw that sticks out more than the rest of the face
Examples from the Corpus
prognathous• In the prognathous head the long axis is horizontal, or slightly inclined ventrally, while the mouthparts are anterior in position.Origin prognathous (1800-1900) pro- + Greek gnathos “jaw” 