American Heritage® Dictionary of the English Language, Fourth Edition
- v. To harden the surface of (a metal).
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.
GNU Webster's 1913
- v. to harden (steel) by adding carbon.
- v. harden steel by adding carbon
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