What is "rhamnus frangula"

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.

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. Black alder.

1. A European shrub ( Rhamnus frangula); Alder buckthorn.

2. An American species of holly ( Ilex verticillata), bearing red berries.