/ Dictionary / Index M madman: Meaning and Definition of Find definitions for: mad•man Pronunciation: (mad'man", -mun), [key] — pl. -men a person who is or behaves as if insane; lunatic; maniac. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: madman (Thesaurus) madm. mad money Related Content Daily Word Quiz: vernacular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language