/ Dictionary / Index C cobaltous: Meaning and Definition of Find definitions for: co•bal•tous Pronunciation: (kō-bôl'tus), [key] — adj. containing bivalent cobalt. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cobaltite cobaltous hydroxide Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language