The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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; to precipitate from a solution in the form of
   crystals.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

crystallize
    v 1: cause to take on a definite and clear shape; "He tried to
         crystallize his thoughts" [syn: crystallize,
         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,
       crystallize, crystallise, crystalize, crystalise,
       straighten out, sort out, enlighten, illuminate,
       elucidate]
    3: cause to form crystals or assume crystalline form;
       "crystallize minerals" [syn: crystallize, crystallise,
       crystalize, crystalise]
    4: assume crystalline form; become crystallized [syn:
       crystallize, crystalize, crystalise, effloresce]