/ Dictionary / Index A atmo-: Meaning and Definition of Find definitions for: atmo- Pronunciation: [key] a combining form meaning “air,” used in the formation of compound words: atmosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. atman atmolysis Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language