WordReference Random House Unabridged Dictionary of American English © 2026
prog•na•thous  (prog′nə thəs, prog nā′-),USA pronunciation adj. [Craniom.]
  1. Anatomy, Physical Anthropologyhaving protrusive jaws; having a gnathic index over 103.
Also, prog•nath•ic  (prog nath′ik).USA pronunciation 
  • pro-2 + -gnathous 1830–40
prog•na•thism  (prog′nə thiz′əm),USA pronunciation prog′na•thy, n. 
Collins Concise English Dictionary © HarperCollins Publishers::
prognathous /prɒɡˈneɪθəs/, prognathic /prɒɡˈnæθɪk/ adj
  1. having a projecting lower jaw
Etymology: 19th Century: from pro-2 + Greek gnathos jaw
'prognathic' also found in these entries (note: many are not synonyms or translations):
prognathous

Forum discussions with the word(s) "prognathic" in the title:


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