xylosteinChem.|zaɪˈlɒstɪɪn| [f.mod.L. Xylosteum (f.Gr. ξύλον wood + ὀστέον bone) + -in1.] A poisonous bitter substance found in the berries of the fly-honeysuckle, Lonicera Xylosteum. 1868Watts Dict.Chem. V. 1061. 1871 ― tr.Gmelin's Hand-bk.Chem. XVI. 102.