frangulinChem.|ˈfræŋgjʊlɪn| [f. the mod.Lat. name of the tree (Rhamnus) Frangula. + -in.] (See quot.) Hence franˈgulic (acid)a. 1864Watts Dict.Chem. II. 706 Frangulin..a yellow crystallisable colouring matter, contained in the bark of the berry-bearing alder.1872Ibid.Suppl. 623 Frangulic acid.