billon

詳細解釋：

bil.lon

n.（名詞）
An alloy of gold or silver with a greater proportion of another metal, such as copper, used in making coins.
金銀合金：金或銀與大部分其他金屬，如銅的合金，用於鑄幣
An alloy of silver with a high percentage of copper, used in making medals and tokens.
含銅較高的銀：銀和高比例銅的合金，用於鑄紀念章和輔幣

來源：
French
法文
from Old French [ingot]
源自 古法文 [鑄塊]
from bille [log] * see billet 2
源自 bille [木材] *參見 billet2