'polygalic acid' definitions:

Definition of 'polygalic acid'

From: GCIDE
  • Saponin \Sap"o*nin\, n. [L. sapo, -onis soap: cf. F. saponine.] (Chem.) A poisonous glucoside found in many plants, as in the root of soapwort (Saponaria officinalis), in the bark of soap bark (Quillaja saponaria), etc. It is extracted as a white amorphous powder, which produces a soapy lather in solution, and produces a local anaesthesia. It is used as a detergent and for emulsifying oils. Formerly called also struthiin, quillaiin, senegin, polygalic acid, etc. By extension, any one of a group of related bodies of which saponin proper is the type. [1913 Webster + PJC]