noun pl. copper -·per or coppers -·pers

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
2. Now Chiefly Brit.
   1. a coin of copper or bronze, as a penny
   2. a large metal container or boiler, orig. of copper
3. the color of copper; reddish brown
4. any of various small, copper-colored butterflies (family Lycaenidae) found in temperate regions

Etymology: ME & OE coper < LL cuprum, contr. < Cyprium (aes), Cyprian (brass), copper, after Gr Kyprios, Cyprus, noted for its copper mines

adjective

1. of copper
2. copper-colored; reddish-brown

transitive verb

1. to cover or coat with copper
2. ☆

   Etymology: from use of a copper coin to indicate such a bet in faro

   Slang to bet against (another's bet)