/ Dictionary / Index C copper naphthenate: Meaning and Definition of Find definitions for: cop'per naph'the•nate Pronunciation: (naf'thu-nāt", nap'-), [key] — Chem. Chem. a green salt, soluble in benzene, used as an insecticide and a wood preservative, but harmless to plants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Coppermine copperon Related Content Daily Word Quiz: laudable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language