/ Dictionary / Index C copper hydroxide: Meaning and Definition of Find definitions for: cop'per hydrox'ide Pronunciation: [key] a blue, water-insoluble, poisonous powder, Cu(OH), used in the manufacture of rayon, as a source for copper salts, and as a mordant. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Copperheadism copper iris Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language