I. A genus of lichens. 2. Iceland moss. A lichen, C. Istandica, found in Iceland and other northern countries. It contains a form of starch, Lichenin, that gelatinizes when boiled with water. It is a feebly tonic demulcent, sometimes recommended in pulmonary affections. C., Decoct., contains five per cent, of the lichen. Dose 5 ij-iv.

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Definition of  CETRARIA