/ Dictionary / Index C chalco-: Meaning and Definition of Find definitions for: chalco- Pronunciation: [key] a learned borrowing from Greek meaning “copper,” used in the formation of compound words: chalcolithic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Chalcis chalcocite Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language