orchil
/ˈɔːkɪl/noun
1
- mass noun a red or violet dye obtained from certain lichens, used as a source of litmus, orcinol, and other pigments苔色素。
2
- a lichen with flattened fronds from which such a dye may be obtained（地衣）染料衣。
2.1
- Roccella (order Graphidiales) and other genera: several species, including the Mediterranean R. tinctoria, used for dyeing, and the Madagascan R. montagnei, used for litmus.染料衣（文字衣目）及其他属：数种, 包括用于染色的地中海染料地衣和用作石蕊的马达加斯加蒙氏染料地衣。
词源
late 15th cent.: from Old French orcheil, related to Spanish urchilla; of uncertain origin.