The Collaborative International Dictionary of English v.0.48:

Anagrammatic \An`a*gram*mat"ic\, Anagrammatical
\An`a*gram*mat"ic*al\, a. [Cf. F. anagrammatique.]
   Pertaining to, containing, or making, an anagram. --
   An`a*gram*mat"ic*al*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anagrammatical
    adj 1: related to anagrams or containing or making an anagram
           [syn: anagrammatic, anagrammatical]