Nearby Words

case harden

[keys-hahr-dn]

case·hard·en

[keys-hahr-dn]
verb (used with object)
1.
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.
2.
to harden in spirit so as to render insensible or insensitive to external impressions or influences; make callous.

Origin:
1670–80; case2 + harden
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Case harden is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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