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|Noun||1.||pyrophoric alloy - an alloy that emits sparks when struck or scratched with steel; used in lighter flints|
alloy, metal - a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten; "brass is an alloy of zinc and copper"
ferrocerium - a pyrophoric alloy of iron with cerium; used for lighter flints
misch metal - a pyrophoric alloy made from a mixture of rare-earth metals