/ Dictionary / Index D die-off: Meaning and Definition of Find definitions for: die-off Pronunciation: (dī'ôf", -of"), [key] — n. a sudden, natural perishing of large numbers of a species, population, or community. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: die-off (Thesaurus) diene Dieppe Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language