Chem. [f. as prec. + -IN.] An acid (C20 H22 O10) discovered by Heeren in Roccella tinctoria; it appears also to be contained in most of the lichens from which archil is prepared (Watts, Dict. Chem., 1882).
1838. T. Thomson, Chem. Org. Bodies, 385. The erythrin undergoes a notable change, for it is insoluble in water.