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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Or·cin n.  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.
 

From: WordNet (r) 2.0

 lecanora
      n : any lichen of the genus Lecanora; some used in dyeing; some
          used for food