From Longman Dictionary of Contemporary Englishcoppercop‧per /ˈkɒpə $ ˈkɑːpər/ ●●○ noun 1 [uncountable]HCM a soft reddish-brown metal that allows electricity and heat to pass through it easily, and is used to make electrical wires, water pipes etc. It is a chemical element: symbol Cu2 → coppers3 [uncountable]CC a reddish-brown colour her copper hair4 [countable]SCP British English informal a police officer —coppery adjective coppery skin
Examples from the Corpus
copper• copper lipstick• The first copper light of morning was creeping up Great Head bluff and spilling over the harbor.• Small quantities of copper are often fatal to invertebrates.• Some countries are rich because they have oil or copper or iron.• These small copper alloy balances had an inverted T-shaped beam supported from its centre by a suspension arm.• Leak-Fix seals leaks in tanks made of steel, copper, lead, aluminium and glass fibre.• Adding the copper, which is another metal toxin, only hastened the death of the fish.• The nine-second fire was sparked by a breach of the synthetic insulation surrounding 10 hair-thin copper wires within the cord.• The devices wound with copper are usually replaced every two-to-five years, depending on which type you have.From Longman Business Dictionarycoppercop‧per /ˈkɒpəˈkɑːpər/ noun1[uncountable] a reddish-brown metal used, among other things, for making wire and CABLEsOn Friday, copper for March delivery ended at 98.9 cents a pound, up 1.9 cents.The company is a major producer of copper products.2coppers [plural] British English coins of low value made of copper or other dark-coloured metalsHe counted out three pounds, all in coppers.Origin copper Old English coper, from Late Latin cuprum, from Latin (aes) Cyprium “metal of Cyprus, copper” 