Orcin \Or"cin\, n. [Etymology uncertain: cf. F. orcine.] (Chem.)
A colorless crystalline substance, {C6H3.CH3.(OH)2}, which is
obtained from certain lichens ({Roccella}, {Lecanora}, etc.),
also from extract of aloes, and artificially from certain
derivatives of toluene. It changes readily into orcein.
[1913 Webster]