/ Dictionary / Index C cuprammonium: Meaning and Definition of Find definitions for: cu•pram•mo•ni•um Pronunciation: (ky"pru-mō'nē-um, -mōn'yum, k"-), [key] — n. Chem. any cation containing copper and ammonia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cupr- cupreous Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language