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Meaning of superalloy

su•per•al•loy

Pronunciation: (s'pur-al"oi), [key]
— n.
  1. an alloy, often with a nickel, nickel-iron, or cobalt base, capable of withstanding very high temperatures, used in jet engines, rockets, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.