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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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]