Metal — elements or alloys such as iron, copper, aluminum; used as materials.
この机は金属製で重い。
This desk is made of metal and is heavy.
金属アレルギーでアクセサリーが合わない。
I have a metal allergy, so accessories don't suit me.
鉄や銅は代表的な金属だ。
Iron and copper are representative metals.