The Collaborative International Dictionary of English v.0.48:

Glycyrrhizin \Gly*cyr"rhi*zin\, n. [Cf. F. glycyrrhizine. See
   Glycyrrhiza.] (Chem.)
   A glucoside found in licorice root (Glycyrrhiza), in
   monesia bark (Chrysophyllum), in the root of the walnut,
   etc., and extracted as a yellow, amorphous powder, of a
   bittersweet taste. Glyn