Search Result for "face-harden": 
Wordnet 3.0

VERB (1)

1. harden steel by adding carbon; 



The Collaborative International Dictionary of English v.0.48:

face-harden \face-harden\ v. t.
   to harden (steel) by adding carbon.
   [WordNet 1.5]


WordNet (r) 3.0 (2006):

face-harden
    v 1: harden steel by adding carbon