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From The Collaborative International Dictionary of English v.0.48:
Xylostein \Xy*los"te*in\, n. [Xylo- + Gr. 'oste`on bone.] (Chem.) A glucoside found in the poisonous berries of a species of honeysuckle (Lonicera xylosteum), and extracted as a bitter, white, crystalline substance. [1913 Webster]