砲ほう金きんほうきんMeanings1noungun metalRefers 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.
