bil·lon 
(bĭlən)
(bĭlən)n.
1. An alloy of gold or silver with a greater proportion of another metal, such as copper, used in making coins.
2. An alloy of silver with a high percentage of copper, used in making medals and tokens.
[French, from Old French, ingot, from bille, log; see BILLET2.]
- underlying
- undermine
- undermodulate
- undermodulation
- undermost
- underneath
- under no circumstances
- under nose
- undernourish
- undernourishment
- undernutrition
- under oath
- under (one's) belt
- under one's belt
- under (one's) breath
- under one's breath
- under (one's) hat
- under one's hat
- under (one's) wing
- under one's wing
- underpaid
- under pain of
- underpants
- underpart
- underpass