/ Dictionary / Index D duo: Meaning and Definition of Find definitions for: du•o Pronunciation: (d'ō, dy'ō), [key] — pl. du•os. duet. two persons commonly associated with each other; couple. two animals or objects of the same sort; two things ordinarily placed or found together; a pair: a duo of lovebirds. duo- Pronunciation: [key] a combining form meaning “two,” used in the formation of compound words: duologue. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: duo (Thesaurus) dunt duodecagon Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language