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From The Collaborative International Dictionary of English v.0.48:
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]