ErythrinE*ryth"rin\, Erythrine \E*ryth"rine\, n. [Gr. 'eryqro`s red.]1. (Chem.) A colorless 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. 2. (Min.) See Erythrite, 2.