Definition of face-harden http://www.blass.com.au/definitions/face-harden/rss Blass Online English Dictionary. en-us Copyright 2008 Blass.com.au 720 Blass Online English Dictionary http://www.blass.com.au/blass_logo.gif http://www.blass.com.au/ 182 43 Free online english dictionary. face-harden http://www.blass.com.au/definitions/face-harden verb: harden steel by adding carbon