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Meaning of orthognathous

or•thog•na•thous

Pronunciation: (ôr-thog'nu-thus), [key]
— adj. Craniom.
  1. straight-jawed; having the profile of the face vertical or nearly so; having a gnathic index below 98.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.