/ Dictionary / Index M macadam: Meaning and Definition of Find definitions for: mac•ad•am Pronunciation: (mu-kad'um), [key] — n. a macadamized road or pavement. the broken stone used in making such a road. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: macadam (Thesaurus) macaco macadamia Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language