The Collaborative International Dictionary of English v.0.48:

Post-disseizor \Post`-dis*sei"zor\, n. [Pref. post- +
   disseizor.] (O. Eng. Law)
   A person who disseizes another of lands which the disseizee
   had before recovered of the same disseizor. --Blackstone.
   [1913 Webster]