a learned borrowing from Greek meaning “copper,” used in the formation of compound words: chalcolithic.

< Greek chalko-, combining form of chalkós copper Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chalco- or (before a vowel) chalc-
combining form
indicating copper or a copper alloy: chalcopyrite; chalcolithic
[from Greek khalkos copper]
chalc- or (before a vowel) chalc-
combining form
[from Greek khalkos copper]

Collins English Dictionary - Complete & Unabridged 10th Edition
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