• (n.) A glucoside found in the poisonous berries of a species of honeysuckle (Lonicera xylosteum), and extracted as a bitter, white, crystalline substance.
Xy·los'te·in noun [ Xylo- + Greek ... bone.] (Chemistry) A glucoside found in the poisonous berries of a species of honeysuckle ( Lonicera xylosteum ), and extracted as a bitter, white, crystalline substance.