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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]