/ Dictionary / Index D delts: Meaning and Definition of Find definitions for: delts Pronunciation: (delts), [key] deltoid muscles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. deltoidal delubrum Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language