The Collaborative International Dictionary of English v.0.48:

Constuprate \Con"stu*prate\, v. t. [imp. & p. p.
   Construprated; p. p. & vb. n. Constuprating.] [L.
   constupratus, p. p. of constuprare to ravish; con- + stuprare
   to ravish, stuprum rape.]
   To ravish; to debauch. --Burton.
   [1913 Webster]