copper · noun U /ˈkɑp.ər/Full view
B2 a reddish-brown metal used especially for making wire and coins, or the reddish brown color of this metal
Dictionary examples:

copper wire/pipes

Rosie's hair shone like copper in the sunlight.

Learner example:

Its domes are made of pure copper, inside there's a big bell called "Zygmunt". (First Certificate in English; B2; Polish)

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