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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Cet·ra·rin n.  Chem. A white substance extracted from the lichen, Iceland moss (Cetraria Islandica). It consists of several ingredients, among which is cetraric acid, a white, crystalline, bitter substance.
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From: WordNet (r) 2.0

 Cetraria islandica
      n : lichen with branched flattened partly erect thallus that
          grows in mountainous and arctic regions; used as a
          medicine or food for humans and livestock; a source of
          glycerol [syn: Iceland moss, Iceland lichen]