Found 2 items, similar to Roccella.
English → English (WordNet) Definition: roccella roccella n : a source of the dye archil and of litmus [syn: Roccella tinctoria ]
English → English (gcide) Definition: Roccella Orcin \Or"cin\, n. [Etymology uncertain: cf. F. orcine.] (Chem.) A colorless crystalline substance, C6H3.CH3.(OH)2, which is obtained from certain lichens (Roccella, Lecanora, etc.), also from extract of aloes, and artificially from certain derivatives of toluene. It changes readily into orcein. [1913 Webster]