copper

A reddish-brown metallic chemical element (symbol Cu) with the atomic number 29; also, the metal made up of this element.

The reddish-brown colour of copper (etymology 1 sense 1).

In full copper butterfly: any of various lycaenid butterflies with copper-coloured upperwings, especially those of the genera Lycaena and Paralucia.

Any of various specialized items made of copper (etymology 1 sense 1), where the use of the metal is either necessary or traditional to the function of the item.

A copper mug used for drinking alcoholic beverages.

A copper sheet on which an image or writing is engraved.

A coin, typically of a small denomination, originally made of copper and now chiefly of other metals such as bronze; specifically, an English or British penny or halfpenny; also, a United States cent; (uncountable) coins made of copper collectively.

In the game of faro: originally a copper coin, now usually a small disc or token, placed on a playing card to indicate that a player bets against that card.

A large pot, originally made of copper but later often of iron, filled with water and heated over a fire for cooking, washing clothes, etc.