transpeciate

from The Collaborative International Dictionary of English v.0.48

Transpeciate \Tran*spe"ci*ate\, v. t. [Pref. trans- + L. species
   form.]
   To change from one species to another; to transform. [Obs.]
   [1913 Webster]

         Power to transpeciate a man into a horse. --Sir T.
                                                  Browne.
   [1913 Webster]