aurinChem.|ˈɔːrɪn| [f. L. aur-um gold + -in.] A red colouring matter produced (by Kolbe and Schmidt in 1861) by heating phenol with oxalic acid and strong sulphuric acid. 1869Eng.Mech. 19 Mar. 586/3 Rosolic acid, or aurine..from coaltar.1883Athenæum 10 Mar. 316/2 Aurin.