erythrin / erythrine [ɛˈrɪθrən]
erythrin – n. – 1. Chemistry, a colourless crystalline substance, C20H22O10, extracted from certain lichens, as the various species of Rocella. It is a derivative of orsellinic acid, so called because of certain red compounds derived from it – called also erythric acid
erythrine – erythrite, a mineral, CO3(AsO4)2·8H20, consisting of a hydrous cobalt arsenate occurring in monochlinic crystals isomorphous with annabergite and also in globular and reniform masses and in earthy form, and being usually rose red