/ Dictionary / Index C cosm-: Meaning and Definition of Find definitions for: cosm- Pronunciation: [key] var. ofbefore a vowel: cosmism. -cosm Pronunciation: [key] var. ofas final element of a compound word: microcosm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cos lettuce cosmetic Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language