/ Dictionary / Index B bismuthous: Meaning and Definition of Find definitions for: bis•muth•ous Pronunciation: (biz'mu-thus), [key] — adj. Chem. containing trivalent bismuth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bismuthinite bismuth oxychloride Related Content Daily Word Quiz: stellar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language