Source : Webster's Revised Unabridged Dictionary (1913)

Brucine \Bru"cine\, n. [Cf. F. brucine, fr. James Bruce, a
   Scottish traveler.] (Chem.)
   A powerful vegetable alkaloid, found, associated with
   strychnine, in the seeds of different species of {Strychnos},
   especially in the {Nux vomica}. It is less powerful than
   strychnine. Called also {brucia} and {brucina}.

Source : WordNet®

brucine
     n : a bitter alkaloid poison resembling strychnine and extracted
         from nux vomica