/ Dictionary / Index B bituminous: Meaning and Definition of Find definitions for: bi•tu•mi•nous Pronunciation: (bī-t'mu-nus, -ty'-, bi-), [key] — adj. resembling or containing bitumen: bituminous shale. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bituminous (Thesaurus) bituminize bituminous coal Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language