The Collaborative International Dictionary of English v.0.48:

Defix \De*fix"\, v. t. [L. defixus, p. p. of defigere to fix;
   de- + figere to fix.]
   To fix; to fasten; to establish. [Obs.] "To defix their
   princely seat . . . in that extreme province." --Hakluyt.
   [1913 Webster]