• Webster's Revised Unabridged Dictionary
    • n Cetrarin (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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Century Dictionary and Cyclopedia
    • n cetrarin A vegetable substance extracted by alcohol from several lichens, as Cetraria Islandica (Iceland moss) and Sticta pulmonacea. It forms a fine white powder, very bitter to the taste.
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Webster's Revised Unabridged Dictionary
From Cetraria, Islandica, the scientific name of Iceland moss