nCetrarin(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.
Century Dictionary and Cyclopedia
ncetrarinA 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.
Webster's Revised Unabridged Dictionary
From Cetraria, Islandica, the scientific name of Iceland moss