/ Dictionary / Index B bitumen: Meaning and Definition of Find definitions for: bi•tu•men Pronunciation: (bī-t'mun, -ty'-, bi-, bich'oo-), [key] — n. any of various natural substances, as asphalt, maltha, or gilsonite, consisting mainly of hydrocarbons. (formerly) an asphalt of Asia Minor used as cement and mortar. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bitumen (Thesaurus) bitty bituminize Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language