The Collaborative International Dictionary of English v.0.48:

Anathematize \A*nath"e*ma*tize\, v. t. [imp. & p. p.
   Anathematized; p. pr. & vb. n. Anathematizing.] [L.
   anathematizare, Gr. ? to devote, make accursed: cf. F.
   anath['e]matiser.]
   To pronounce an anathema against; to curse. Hence: To condemn
   publicly as something accursed. --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anathematize
    v 1: curse or declare to be evil or anathema or threaten with
         divine punishment [syn: accurse, execrate,
         anathemize, comminate, anathemise, anathematize,
         anathematise]