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superalloy

[soo-per-al-oi]
noun
  1. an alloy, often with a nickel, nickel-iron, or cobalt base, capable of withstanding very high temperatures, used in jet engines, rockets, etc.
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Origin of superalloy

First recorded in 1945–50; super- + alloy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018