/ Dictionary / Index G gonion: Meaning and Definition of Find definitions for: go•ni•on Pronunciation: (gō'nē-on"), [key] — pl. -ni•a a point on each side of the lower jaw at the mandibular angle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gonion (Thesaurus) goniometer gonioscope Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language