1. (v. t.) To subject to a process which converts the surface of iron into steel.

2. (v. t.) To render insensible to good influences.

acclimate acclimatize accommodate accustom adapt adjust anneal be tough beef up brace brace up break break in brutalize buttress cake calcify callous case harden caseharden compact concrete condition confirm conform congeal consolidate cornify crystallize densify domesticate domesticize dry endure establish familiarize firm fix fortify fossilize freeze gentle gird habituate hang tough housebreak indurate intensify inure invigorate lapidify lithify naturalize nerve orient orientate ossify petrify prop refresh reinforce reinvigorate restrengthen season set shore up solidify steel stiffen strengthen support sustain tame temper toughen train turn to stone undergird vitrify wont