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English definition of “copper”

copper

noun (METAL)    /ˈkɒp.ər/ US  /ˈkɑː.pɚ/
B2 [U] (symbol Cu) a chemical element that is a reddish-brown metal, used especially for making wire and coins: copper wire/pipes a copper alloyChemical elementsLess common coloursCommon colours [U] the reddish-brown colour of the metal copper: The copper of Rosie's hair shone in the sunlight. [C usually plural] UK informal a brown coin of low value: I gave him a few coppers.British money copper     adjective of the reddish-brown colour of the metal copper
(Definition of copper noun (METAL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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