- Metallurgy. to make the outside surface of (an alloy having an iron base) hard by carburizing and heat treatment, leaving the interior tough and ductile.
- to harden in spirit so as to render insensible or insensitive to external impressions or influences; make callous.
Origin of caseharden
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for caseharden
I have a peculiar kind of steel which I cannot harden by fire and water, neither will it caseharden by prussiate of potash.