crotal

• 名词，指石蕊属（Parmelia）等多种地衣中的任何一种，可用于提取红棕色或紫色染料。

A noun referring to any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made.

1. Dye-producing lichenC2formalbritish

   Any of several lichens, especially from the genus Parmelia, used to produce reddish-brown or purple dyes.

   染料地衣

   • The ancient Scots used crotal to dye their wool.
   • Crotal gives a distinctive reddish-brown color to traditional tweed.
   • Harvesting crotal for dye is a traditional craft in the Highlands.

   同义词crottle