/ Dictionary / Index C cuprous: Meaning and Definition of Find definitions for: cu•prous Pronunciation: (ky'prus, k'-), [key] — adj. containing copper in the univalent state, as cuprous oxide, CuO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cuprous (Thesaurus) cupronickel cuprous cyanide Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language