The Collaborative International Dictionary of English v.0.48:

Jervine \Jer"vine\, n. [Prob. fr. Sp. yerba herb, OSp., the
   poison of the veratrum.] (Chem.)
   A poisonous alkaloid resembling veratrine, and found with it
   in white hellebore (Veratrum album); -- called also
   jervina.
   [1913 Webster]