Al·der n.  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.
 Black alder. (a) A European shrub (Rhamnus frangula); Alder buckthorn. (b) An American species of holly (Ilex verticillata), bearing red berries.

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 Fran·gu·lic 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.

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 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.

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