The Collaborative International Dictionary of English v.0.48:

Anagram \An"a*gram\ ([a^]n"[.a]*gr[a^]m), n. [F. anagramme, LL.
   anagramma, fr. Gr. 'ana` back, again + gra`fein to write. See
   Graphic.]
   Literally, the letters of a word read backwards, but in its
   usual wider sense, the change of one word or phrase into
   another by the transposition of its letters. Thus Galenus
   becomes angelus; William Noy (attorney-general to Charles I.,
   and a laborious man) may be turned into I moyl in law.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Anagram \An"a*gram\, v. t.
   To anagrammatize.
   [1913 Webster]

         Some of these anagramed his name, Benlowes, into
         Benevolus.                               --Warburton.
   [1913 Webster] Anagrammatic

WordNet (r) 3.0 (2006):

anagram
    n 1: a word or phrase spelled by rearranging the letters of
         another word or phrase
    v 1: read letters out of order to discover a hidden meaning
         [syn: anagram, anagrammatize, anagrammatise]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "anagram":
   abuse of terms, acrostic, amphibologism, amphiboly, calembour,
   charade, conundrum, corruption, equivocality, equivoque,
   jeu de mots, logogram, logogriph, malapropism, metagram, missaying,
   palindrome, paronomasia, play on words, pun, punning, rebus,
   riddle, spoonerism, wordplay