: a metal made by melting and mixing two or more metals or a metal and another material together [count] ▪ testing the properties of various alloys [noncount] ▪ a part made of aluminum alloy
— al·loy/əˈloɪ/verb, al·loys;al·loyed;al·loy·ing [+ obj] ▪ Stainless steel is made by alloying steel with chromium.