/ Dictionary / Index M misdiagnosis: Meaning and Definition of Find definitions for: mis•di•ag•no•sis Pronunciation: (mis"dī-ug-nō'sis), [key] — pl. n. -ses an incorrect diagnosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. misdiagnose misdial Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language