/ Dictionary / Index G gonio-: Meaning and Definition of Find definitions for: gonio- Pronunciation: [key] a combining form meaning “angle,” used in the formation of compound words:Cf. -gon. goniometer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gonif goniometer 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