Source : Webster's Revised Unabridged Dictionary (1913)

Salicin \Sal"i*cin\, n. [L. salix, -icis, a willow: cf. F.
   salicine. See {Sallow} the tree.] (Chem.)
   A glucoside found in the bark and leaves of several species
   of willow ({Salix}) and poplar, and extracted as a bitter
   white crystalline substance.