The Collaborative International Dictionary of English v.0.48:

Venefice \Ven"e*fice\, n. [L. veneficium, fr. veneficus
   poisoning; venenum poison + facere to make: cf. F.
   v['e]n['e]fice.]
   The act or practice of poisoning. [Obs.]
   [1913 Webster] Veneficial