/ Dictionary / Index O orthognathous: Meaning and Definition of Find definitions for: or•thog•na•thous Pronunciation: (ôr-thog'nu-thus), [key] — adj. Craniom. 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. orthognathic surgery orthogonal Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language