<p><strong>Noun</strong></p><ul><li>a malleable, ductile, metallic element having a characteristic reddish-brown color: used in large quantities as an electrical conductor and in the manufacture of alloys, as brass and bronze.</li><li>Cu.</li><li>63.54.</li><li><ol start="29"><li></li></ol></li><li>8.92 at 20°C.</li><li>a metallic reddish brown.</li><li>a coin composed of copper, bronze, or the like, as the U.S. cent or the British penny.</li><li>any of several butterflies of the family Lycaenidae, as Lycaena hypophleas American copper, having copper-colored wings spotted and edged with black.</li><li>a container made of copper.</li><li>a tool partly or wholly made of copper: a soldering copper.</li><li>a large kettle, now usually made of iron, used for cooking or to boil laundry.</li></ul><p><strong>Adjective</strong></p><ul><li>made of copper: copper kettles.</li><li>reddish-brown; coppery: The copper sun sank into the sea.</li></ul><p><strong>Verb</strong></p><ul><li>to cover, coat, or sheathe with copper.</li></ul>