This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of several complex temperature-resistant alloys.

n. Any of several high-performance alloys that are resistant to high temperatures

"Thirty-eight percent of annual nickel use is in nonferrous alloys (or mixed with metals other than steel) and [[superalloy]] s (metal mixtures designed to withstand extremely high temperatures and/or pressures, or to have high electrical conductivity)."