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air-hardening

[air-hahr-dn-ing] /ˈɛərˌhɑr dn ɪŋ/
adjective, Metallurgy
1.
noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air.
Origin
1905-1910
1905-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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