/ Dictionary / Index T tarmacadam: Meaning and Definition of Find definitions for: tar•mac•ad•am Pronunciation: (tär'mu-kad"um), [key] — n. a paving material consisting of coarse crushed stone covered with a mixture of tar and bitumen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tarmacadam (Thesaurus) Tarmac tarn Related Content Daily Word Quiz: magnanimous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language