The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

   Frangulinic acid (Chem.), a yellow crystalline substance,
      resembling alizarin, and obtained by the decomposition of
      frangulin.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Alder \Al"der\ ([add]l"d[~e]r), n. [OE. aldir, aller, fr. AS.
   alr, aler, alor, akin to D. els, G. erle, Icel. erlir, erli,
   Swed. al, Dan. elle, el, L. alnus, and E. elm.] (Bot.)
   A tree, usually growing in moist land, and belonging to the
   genus Alnus. The wood is used by turners, etc.; the bark by
   dyers and tanners. In the U. S. the species of alder are
   usually shrubs or small trees.
   [1913 Webster]

   Black alder.
   (a) A European shrub (Rhamnus frangula); Alder buckthorn.
   (b) An American species of holly (Ilex verticillata),
       bearing red berries.
       [1913 Webster] Alder

WordNet (r) 3.0 (2006):

Rhamnus frangula
    n 1: small tree common in Europe [syn: alder buckthorn, alder
         dogwood, Rhamnus frangula]