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prognathous (adj.)

"having protruding jaws," 1836, from pro- + gnatho- "jaw" + -ous. Prognathic (1845) means the same. Related: Prognathism.

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Definitions of prognathous from WordNet

prognathous (adj.)
having a projecting lower jaw;
Synonyms: prognathic / hypognathous
From wordnet.princeton.edu