case-harden

verb case-hard·en \ ˈkās-ˌhär-dᵊn \

Definition of case-harden

1 : to harden (a ferrous alloy) so that the surface layer is harder than the interior
2 : to make callous or insensible

case-hardened

adjective

case-harden was our Word of the Day on 04/26/2009. Hear the podcast!

First Known Use of case-harden

1677

in the meaning defined at sense 1

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