/ Dictionary / Index C Coppermine: Meaning and Definition of Find definitions for: Cop•per•mine Pronunciation: (kop'ur-mīn"), [key] — n. a river in N Canada, in the central Northwest Territories, flowing N to the Arctic Ocean. 525 mi. (845 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. copper-leaf copper naphthenate 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