The Collaborative International Dictionary of English v.0.48:

Ricinine \Ric"i*nine\, n. [L. ricinus castor-oil plant.] (Chem.)
   A bitter white crystalline alkaloid (C8H8N2O2) extracted
   from the seeds of the castor-oil plant (Ricinus
   communalis). Called also ricidine. Ingestion may cause
   vomiting and various other toxic reactions, including liver
   and kidney damage, convulsions, hypotension, and death.
   [1913 Webster +PJC]