/ Dictionary / Index G geo-: Meaning and Definition of Find definitions for: geo- Pronunciation: [key] a combining form meaning “the earth,” used in the formation of compound words: geochemistry. Geo. Pronunciation: [key] George. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -geny geobotany Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language