/ Dictionary / Index M megadeath: Meaning and Definition of Find definitions for: meg•a•death Pronunciation: (meg'u-deth"), [key] — n. a unit of one million deaths: used in estimating or predicting the fatalities that would occur in a nuclear war. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: megadeath (Thesaurus) megadeal megadont 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