Same word as calcify:

amalgamate, anneal, bake, brace, buttress, cake, calcify, callous, cement, close, clot, coagulate, compact, congeal, consolidate, contract, crystallize, curdle, densify, dry, firm, fix, fortify, fossilize, freeze, gird, indurate, jell, nerve, ossify, petrify, precipitate, press, reinforce, set, settle, solidify, starch, steel, stiffen, strengthen, temper, thicken, toughen, vitrify