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From The Collaborative International Dictionary of English v.0.48:
Wrightine \Wright"ine\, n. (Chem.) A rare alkaloid found in the bark of an East Indian apocynaceous tree (Wrightia antidysenterica), and extracted as a bitter white crystalline substance. It was formerly used as a remedy for diarrh[oe]a. Called also conessine, and neriine. [1913 Webster]