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alloy If people mix one type of metal with another type of metal, they make an "alloy." An alloy is a substance made by mixing two or more metals together. If people mix one type of metal with some other kind of substance, the new substance is also called an "alloy."
beryllium a hard, light, gray substance that is one of the chemical elements. Beryllium is sometimes combined with other elements to form an alloy. It is also used in building rockets. (symbol: Be)
iron any alloy of iron with carbon and other elements which can be used to make a variety of tools, containers, and other objects. [1/9 definitions]