Hypertext Webster Gateway: "Roccella"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
roccella
n : a source of the dye archil and of litmus [syn: {Roccella
tinctoria}]
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