orchil

Any of several lichens, chiefly of the genus Roccella, from which a dye is obtained.

The violet dyestuff obtained from any of these lichens.

Same as archil.

See archil.

Any of several lichens, especially those of the genera Roccella and Lecanora.

The dye, orcein, extracted from them.

any of various lecanoras that yield the dye archil

a purplish dye obtained from orchil lichens