Definition of alloy noun from the Oxford Advanced Learner's Dictionary

BrE BrE//ˈælɔɪ//
 
; NAmE NAmE//ˈælɔɪ//
 
[countable, uncountable] a metal that is formed by mixing two types of metal together, or by mixing metal with another substance Brass is an alloy of copper and zinc. alloy steel
Word Origin late 16th cent.: from Old French aloi (noun) and French aloyer (verb), both from Old French aloier, aleier ‘combine’, from Latin alligare ‘bind’. In early use the term denoted the comparative purity of gold or silver; the sense ‘mixture of metals’ arose in the mid 17th cent.
See the Oxford Advanced American Dictionary entry: alloy

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