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.
Historical Examples

I have a peculiar kind of steel which I cannot harden by fire and water, neither will it caseharden by prussiate of potash.
Scientific American, Vol. XXXIX.–No. 24. [New Series.], December 14, 1878 Various


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