1
- mass noun a red-brown metal, the chemical element of atomic number 29. (Symbol: Cu)铜（符号： Cu）。
- Copper was the earliest metal to be used by humans, first by itself and then later alloyed with tin to form bronze. A ductile easily worked metal, it is a very good conductor of heat and electricity and is used especially for electrical wiring.
2
coppers
Brit. brown coins of low value made of copper or bronze〈英〉（小面值）铜币。
2.1
- dated a large container made of copper or iron for boiling or washing〈旧〉（烧煮或洗东西用的）铜制（或铁制）大容器。
3
- mass noun a reddish-brown colour like that of copper紫铜色。
4
- with modifier a small butterfly with bright reddish-brown wings灰蝶, 铜色蝶。
4.1
- Genus Lycaena, family Lycaenidae: many species灰蝶属, 灰蝶科, 多种。
词源
Old English copor, coper （related to Dutch koper and German Kupfer）, based on late Latin cuprum, from Latin cyprium aes 'Cyprus metal' (so named because Cyprus was the chief source).