/ Dictionary / Index G gnathion: Meaning and Definition of Find definitions for: gna•thi•on Pronunciation: (nā'thē-on", nath'ē-), [key] — n. the lowest point on the anterior margin of the lower jaw in the midsaggital plane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gnathion (Thesaurus) gnathic index gnathite Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language