WordReference Random House Unabridged Dictionary of American English © 2026
me•sog•na•thous  (mi zog′nə thəs, -sog′-),USA pronunciation adj. [Anthropol.]
  1. Physical Anthropologyhaving medium, slightly protruding jaws.
  2. Physical Anthropologyhaving a moderate or intermediate gnathic index of from 98 to 103.
Also, mes•og•nath•ic  (mez′əg nath′ik, mes′-, mē′zəg-, -səg-).USA pronunciation 
  • meso- + -gnathous 1875–80
me•sog′na•thism, me•sog′na•thy, n. 

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