The Collaborative International Dictionary of English v.0.48:

Solanine \Sol"a*nine\, n. [L. solanum nightshade.] (Chem.)
   A poisonous alkaloid glucoside extracted from the berries of
   common nightshade (Solanum nigrum), and of bittersweet, and
   from potato sprouts, as a white crystalline substance having
   an acrid, burning taste; -- called also solonia, and
   solanina.
   [1913 Webster]