American Heritage® Dictionary of the English Language, Fourth Edition
- n. A brittle, grayish-brown, Arctic lichen (Cetraria islandica) sometimes used as a food or in medicine.
Century Dictionary and Cyclopedia
- n. etc. See the nouns.
GNU Webster's 1913
- (Bot.) A kind of lichen (Cetraria Icelandica) found from the Arctic regions to the North Temperate zone. It furnishes a nutritious jelly and other forms of food, and is used in pulmonary complaints as a demulcent.
- n. a lichen. See Iceland Moss.
- 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
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