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ricin (n.)

poison obtained from the castor-oil bean, 1888, from ricinus, genus name of the castor-oil plant (1694), from Latin ricinus (Pliny), of uncertain origin, perhaps the same word as ricinus "tick" (in sheep, dogs, etc.).

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Definitions of ricin from WordNet

ricin (n.)
a toxic protein extracted from castor beans; used as a chemical reagent; can be used as a bioweapon;
one milligram of ricin can kill an adult
Synonyms: ricin toxin
From wordnet.princeton.edu