Cop"per (?), n. [OE. coper (cf. D. koper, Sw. koppar, Dan. kobber, G. kupfer), LL. cuper, fr. L. cuprum for earlier Cyprium, Cyprium aes, i.e., Cyprian brass, fr. Gr. Κυπριος of Cyprus (Gr. Κυπρος), anciently renowned for its copper mines. Cf. Cypreous.]


A common metal of a reddish color, both ductile and malleable, and very tenacious. It is one of the best conductors of heat and electricity. Symbol Cu. Atomic weight 63.3. It is one of the most useful metals in itself, and also in its alloys, brass and bronze.

Copper is the only metal which occurs native abundantly in large masses; it is found also in various ores, of which the most important are chalcopyrite, chalcocite, cuprite, and malachite. Copper mixed with tin forms bell metal; with a smaller proportion, bronze; and with zinc, it forms brass, pinchbeck, and other alloys.


A coin made of copper; a penny, cent, or other minor coin of copper.


My friends filled my pockets with coppers. Franklin.


A vessel, especially a large boiler, made of copper.

4. pl. Specifically Naut.,

the boilers in the galley for cooking; as, a ship's coppers.

Copper is often used adjectively, commonly in the sense of made or consisting of copper, or resembling copper; as, a copper boiler, tube, etc.

All in a hot and copper sky. Coleridge.

It is sometimes written in combination; as, copperplate, coppersmith, copper-colored.

Copper finch. Zool. See Chaffinch. -- Copper glance, ∨ Vitreous copper. Min. See Chalcocite. -- Indigo copper. Min. See Covelline.


© Webster 1913.

Cop"per, v. t. [imp. & p.p. Coppered (?); & vb.n. Coppering.]

To cover or coat with copper; to sheathe with sheets of copper; as, to copper a ship.


© Webster 1913.