Source : Webster's Revised Unabridged Dictionary (1913)

Anagrammatize \An`a*gram"ma*tize\, v. t. [Gr. ? cf. F.
   anagrammatiser.]
   To transpose, as the letters of a word, so as to form an
   anagram. --Cudworth.

Source : WordNet®

anagrammatize
     v : read letters out of order to discover a hidden meaning [syn:
          {anagram}, {anagrammatise}]