billon

n. 比朗金(或银)合金

bil.lon

n.（名词）
An alloy of gold or silver with a greater proportion of another metal, such as copper, used in making coins.
金银合金：金或银与大部分其他金属，如铜的合金，用于铸币
An alloy of silver with a high percentage of copper, used in making medals and tokens.
含铜较高的银：银和高比例铜的合金，用于铸纪念章和辅币

来源：
French
法语
from Old French [ingot]
源自 古法语 [铸块]
from bille [log] * see billet 2
源自 bille [木材] *参见 billet2