The Collaborative International Dictionary of English v.0.48:

Colchicine \Col"chi*cine\ (? or ?), n. [Cf. F. colchicine.]
   (Chem.)
   A powerful vegetable alkaloid, C17H19NO5, extracted from
   the Colchicum autumnale, or meadow saffron, as a white or
   yellowish amorphous powder, with a harsh, bitter taste; --
   called also colchicia.
   [1913 Webster]

WordNet (r) 3.0 (2006):

colchicine
    n 1: an analgesic drug derived from the saffron plant and used
         to treat gout