砲ほう金きん

noun

gun metal

Refers to the alloy used for casting cannons and similar applications; a technical term in metallurgy.

• 砲ほう金きんは銅どうと錫すずの合ごう金きんで、昔むかしは大たい砲ほうの材ざい料りょうとして使つかわれた。

  Gun metal is an alloy of copper and tin, and was once used as a material for cannons.