Source : Webster's Revised Unabridged Dictionary (1913)

Frangulic \Fran*gu"lic\, Frangulinic \Fran`gu*lin"ic\, a.
   (Chem.)
   Pertaining to, or drived from, frangulin, or a species
   ({Rhamnus Frangula}) of the buckthorn.

   {Frangulinic acid} (Chem.), a yellow crystalline substance,
      resembling alizarin, and obtained by the decomposition of
      frangulin.

Frangulin \Fran"gu*lin\, n. (Chem.)
   A yellow crystalline dyestuff, regarded as a glucoside,
   extracted from a species ({Rhamnus Frangula}) of the
   buckthorn; -- called also {rhamnoxanthin}.

Source : WordNet®

Rhamnus frangula
     n : small tree common in Europe [syn: {alder buckthorn}, {alder
         dogwood}]