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.

Crystallize \Crys"tal*lize\, v. i.
   To be converted into a crystal; to take on a crystalline
   form, through the action of crystallogenic or cohesive
   attraction.

Source : WordNet®

crystallize
     v 1: cause to take on a definite and clear shape; "He tried to
          crystallize his thoughts" [syn: {crystallise}, {crystalise},
           {crystalize}]
     2: make free from confusion or ambiguity; make clear; "Could
        you clarify these remarks?"; "Clear up the question of who
        is at fault" [syn: {clear}, {clear up}, {shed light on}, {crystallise},
         {crystalize}, {crystalise}, {straighten out}, {sort out},
         {enlighten}, {illuminate}, {elucidate}]
     3: cause to form crystals or assume crystalline form;
        "crystallize minerals" [syn: {crystallise}, {crystalize},
        {crystalise}]
     4: assume crystalline form; become crystallized [syn: {crystalize},
         {crystalise}, {effloresce}]