crottal

• 指梅衣属（Parmelia）等多种地衣，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, used to produce reddish brown or purple dyes.

1. Dye-producing lichenC2formalbritish

   Any of several lichens of the genus Parmelia, used historically to produce reddish-brown or purple dyes for textiles.

   染料地衣

   • The crottal was gathered from rocks in the Scottish Highlands.
   • Traditional weavers used crottal to dye wool a rich brown color.
   • The lichen known as crottal gives a distinctive reddish-purple hue.

   同义词crotalcrottle