Source : Webster's Revised Unabridged Dictionary (1913)

Crystallize \Crys"tal*lize\ (kr[i^]s"tal*l[imac]z), v. t. [imp.
   & p. p. {Crystallized} (-l[imac]zd); p. pr. & vb. n.
   {Crystallizing}.] [Cf. F. cristalliser. See {Crystal}.]
   To cause to form crystals, or to assume the crystalline form.

Source : WordNet®

crystallizing
     n : the formation of crystals [syn: {crystallization}, {crystallisation}]