金きん衡こうMeanings1nountroy weightrare termRare technical term for the troy weight system used for precious metals. Compare トロイ衡, which is more common.See also: トロイ衡金きん衡こうオンスは約やく三さん十じゅう一いっ点てん一いちグラムです。A troy ounce is about 31.1 grams.金きん衡こうポンドは常じょう衡こうポンドより軽かるい。A troy pound is lighter than an avoirdupois pound.