\E*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.