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Related to orchil: orcein, archil
ar·chil(ar'kil), [old C.I. 1242]
A violet dye from the lichens Rocella tinctoria and R. fuciformis.
orchil(ôr′kĭl, -chĭl) also
1. Any of several lichens, chiefly of the genus Roccella, from which a dye is obtained.
2. The violet dyestuff obtained from any of these lichens.