noun
a source of the dye archil and of litmus
• Syn: ↑Roccella tinctoria
• Hypernyms: ↑lichen
• Member Holonyms: ↑genus Roccella
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Roccella /rok-selˈə/
noun
A genus of lichens, yielding archil and litmus
ORIGIN: Ital orcella, remodelled on rocca rock; see ↑archil
Useful english dictionary. 2012.