The Collaborative International Dictionary of English v.0.48:

Disseizee \Dis`sei*zee"\, n. (Law)
   A person disseized, or put out of possession of an estate
   unlawfully; -- correlative to disseizor. [Written also
   disseisee.]
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

DISSEISEE, torts. One who is wrongfully put out of possession of his lands.