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]