Alloy Al*loy", n. [OE. alai, OF. alei, F. aloyer, to alloy, alier to ally. See {Alloy}, v. t.] 1. Any combination or compound of metals fused together; a mixture of metals; for example, brass, which is an alloy of copper and zinc. But when mercury is one of the metals, the compound is called an amalgam. [1913 Webster]

2. The quality, or comparative purity, of gold or silver; fineness. [1913 Webster]

3. A baser metal mixed with a finer. [1913 Webster]

Fine silver is silver without the mixture of any baser metal. Alloy is baser metal mixed with it. --Locke. [1913 Webster]

4. Admixture of anything which lessens the value or detracts from; as, no happiness is without alloy. ``Pure English without Latin alloy.'' --F. Harrison. [1913 Webster]

The Collaborative International Dictionary of English. 2000.