Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To harden the surface or case of (iron or steel) by high-temperature shallow infusion of carbon followed by quenching.
  • transitive verb To make callous or insensitive.

from The Century Dictionary.

  • To harden the outer part or surface of, as anything made of iron, by converting the iron into steel.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb To subject to a process which converts the surface of iron into steel.
  • transitive verb To render insensible to good influences.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb To harden the surface of iron or steel by infusing carbon into the surface layer
  • verb by extension To make insensitive to hardship

Etymologies

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