- coppercopper1 [käp′ər]n.pl. copper or coppers [ME & OE coper < LL cuprum, contr. < Cyprium ( aes), Cyprian (brass), copper, after Gr Kyprios,CYPRUS, noted for its copper mines]1. a reddish-brown, malleable, ductile, metallic element that is corrosion-resistant and an excellent conductor of electricity and heat: symbol, Cu; at. no., 29: see the periodic table of elements in the Reference Supplement2. Now Chiefly Brit.a) a coin of copper or bronze, as a pennyb) a large metal container or boiler, orig. of copper3. the color of copper; reddish brown4. any of various small, copper-colored butterflies (family Lycaenidae) found in temperate regionsadj.1. of copper2. copper-colored; reddish-brownvt.1. to cover or coat with copper☆ 2. [from use of a copper coin to indicate such a bet in faro] Slang to bet against (another's bet)copperyadj.copper2 [käp′ər]n.[prob. < COP2]Slang a policeman
English World dictionary. V. Neufeldt. 2014.