The Collaborative International Dictionary of English v.0.48:

bowdlerisation \bowdlerisation\ n.
   the deletion of all passages considered to be indecent.

   Syn: bowdlerization, expurgation.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bowdlerisation
    n 1: written material that has been bowdlerized [syn:
         bowdlerization, bowdlerisation]
    2: the act of deleting or modifying all passages considered to
       be indecent [syn: bowdlerization, bowdlerisation]