| copper | | |
| n. (substance) | 1. atomic number 29, copper, cu | 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. |
| ~ metal, metallic element | any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.. |
| ~ bornite, peacock ore | a mineral consisting of sulfides of copper and iron that is found in copper deposits. |
| ~ chalcocite, copper glance | a heavy grey mineral that is an ore of copper. |
| ~ chalcopyrite, copper pyrites | a yellow copper ore (CuFeS2) made up of copper and iron sulfide. |
| ~ cuprite | a mineral consisting of cuprous oxide that is a source of copper. |
| ~ malachite | a green or blue mineral used as an ore of copper and for making ornamental objects. |
| ~ brass | an alloy of copper and zinc. |
| ~ bronze | an alloy of copper and tin and sometimes other elements; also any copper-base alloy containing other elements in place of tin. |
| ~ blister copper | an impure form of copper having a black blistered surface. |
| ~ conductor | a substance that readily conducts e.g. electricity and heat. |
| n. (possession) | 2. copper | a copper penny. |
| ~ cent, centime, penny | a coin worth one-hundredth of the value of the basic unit. |
| n. (person) | 3. bull, cop, copper, fuzz, pig | uncomplimentary terms for a policeman. |
| ~ colloquialism | a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech. |
| ~ police officer, policeman, officer | a member of a police force.; "it was an accident, officer" |
| n. (attribute) | 4. copper, copper color | a reddish-brown color resembling the color of polished copper. |
| ~ burnt sienna, reddish brown, sepia, venetian red, mahogany | a shade of brown with a tinge of red. |
| n. (animal) | 5. copper | any of various small butterflies of the family Lycaenidae having coppery wings. |
| ~ lycaenid, lycaenid butterfly | any of various butterflies of the family Lycaenidae. |
| ~ genus lycaena, lycaena | type genus of the Lycaenidae; small slender butterflies with upper surface of wings usually metallic blue or green or copper. |
| ~ american copper, lycaena hypophlaeas | common copper butterfly of central and eastern North America. |
| v. (contact) | 6. copper | coat with a layer of copper. |
| ~ coat, surface | put a coat on; cover the surface of; furnish with a surface.; "coat the cake with chocolate" |
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