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xylostein

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]

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