[1] : The Collaborative International Dictionary of English v.0.48

ostracise \os"tracise\, v. t.
   same as ostracize. chiefly brit.
   pjc
see also:
ostracize 

[2] : WordNet (r) 2.0

ostracise
     v 1: expel from a community or group syn: banish, ban, ostracize,
           shun, cast out, blackball
     2: avoid speaking to or dealing with; "ever since i spoke up,
        my colleagues ostracize me" syn: ostracize
see also:
banish ban ostracize shun cast out blackball 

Ostracise >> O Words
Ostracise, definition of term: Ostracise
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