copper · noun U /ˈkɑp.ər/
copper
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)
