[ air-hahr-dn-ing ]
/ ˈɛərˌhɑr dn ɪŋ /
noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air.
The Words That Make Us Tick: What Users Are Looking Up On Dictionary.com Every DayYou may have noticed a nifty new tool scrolling across the top of Dictionary.com. But, what makes it tick?
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