noun, often attributive \ˈkä-pər\

Definition of COPPER

:  a common reddish metallic element that is ductile and malleable and is one of the best conductors of heat and electricity — see element table
:  a coin or token made of copper or bronze
chiefly British :  a large boiler (as for cooking)
:  any of a subfamily (Lycaeninae of the family Lycaenidae) of small butterflies with usually copper-colored wings

Origin of COPPER

Middle English coper, from Old English, from Late Latin cuprum copper, from Latin (aes) Cyprium, literally, Cyprian metal
First Known Use: before 12th century


cop·peredcop·per·ing \ˈkä-p(ə-)riŋ\

Definition of COPPER

transitive verb
:  to coat or sheathe with or as if with copper

First Known Use of COPPER




Definition of COPPER

Origin of COPPER

First Known Use: 1846


noun , often attrib \ˈkäp-ər\   (Medical Dictionary)

Medical Definition of COPPER

: a common reddish metallic element that is ductile and malleable and one of the best conductors of heat and electricity—symbol Cu; see element table
cop·pery \ˈkäp-(ə-)rē\ adjective


noun    (Concise Encyclopedia)

Crystalline copper from Michigan—Courtesy of Ted Boente Collection; photograph, John H. Gerard

Metallic chemical element, one of the transition elements, chemical symbol Cu, atomic number 29. Sometimes found in the free state in nature, it is a reddish metal, very ductile and an unusually good conductor of electricity and heat. Most of the world's copper production is used by the electrical industries; the remainder is combined with other metals (e.g., zinc, tin, nickel) to form alloys such as brass, bronze, nickel silver, and Monel. Copper is part of nearly all coinage metals. In compounds copper usually has valence 1 (cuprous) or 2 (cupric). Cuprous compounds include cuprous oxide, a red pigment and a fungicide; cuprous chloride, a catalyst for certain organic reactions; and cuprous sulfide, with a variety of uses. Cupric compounds include cupric oxide, a pigment, decolorizing agent, and catalyst; cupric chloride, a catalyst, wood preservative, mordant, disinfectant, feed additive, and pigment; and cupric sulfate, a pesticide, germicide, feed additive, and soil additive. Copper is a necessary trace element in the human diet and essential to plant growth; in blue-blooded mollusks and crustaceans it plays the same role in hemocyanin as iron does in hemoglobin.


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