/ Dictionary / Index M mortiferous: Meaning and Definition of Find definitions for: mor•tif•er•ous Pronunciation: (môr-tif'ur-us), [key] — adj. deadly; fatal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mortician mortification Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language