noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air.
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- air-cushion vehicle,
- air-entrained concrete,
- air-launched cruise missile,
- air-lift pump,
Origin of air-hardening
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for air-hardening
This alloy, because hardened simply in air, was called “air-hardening” or “self-hardening.”Inventors at Work|George Iles