| copper | (noun) any of various small butterflies of the family Lycaenidae having coppery wings | - |
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| (noun) a reddish-brown color resembling the color of polished copper | Synonyms: copper color |
| (noun) uncomplimentary terms for a policeman | Synonyms: bull, cop, fuzz, pig |
| (noun) a copper penny | - |
| (noun) a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor | Synonyms: atomic number 29, Cu |
| (verb) coat with a layer of copper | - |
| copperhead | (noun) common coppery brown pit viper of upland eastern United States | Synonyms: Agkistrodon contortrix |
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| (noun) venomous but sluggish reddish-brown snake of Australia | Synonyms: Denisonia superba |
| copperplate | (noun) an engraving consisting of a smooth plate of copper that has been etched or engraved | Synonyms: copperplate engraving |
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| (noun) a print made from an engraved copperplate | - |
| (noun) a graceful style of handwriting based on the writing used on copperplate engravings | - |
| coppersmith | (noun) someone who makes articles from copper | - |
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| copperware | (noun) utensils made with copper | - |
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| coppery | (adjective) of something having the color of copper | Synonyms: copper colored |
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| coppice | (noun) a dense growth of bushes | Synonyms: brush, brushwood, copse, thicket |
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