from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To harden the surface of (a metal).
from the GNU version of the Collaborative International Dictionary of English
- transitive v. to harden (steel) by adding carbon.
from The Century Dictionary and Cyclopedia
- To make hard on the surface; harden a thin layer on the face of (a piece of metal); subject to a face-hardening process.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. harden steel by adding carbon
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