ex·pur·gate 
(ĕkspər-gāt′)
(ĕkspər-gāt′)tr.v. ex·pur·gat·ed, ex·pur·gat·ing, ex·pur·gates
To remove erroneous, vulgar, obscene, or otherwise objectionable material from (a book, for example) before publication.
[Latin expūrgāre, expūrgāt-, to purify : ex-, intensive pref.; see EX- + pūrgāre, to cleanse; see peuə- in the Appendix of Indo-European roots.]
ex′pur·gation n.
expur·ga′tor n.