Cudbear
Cudbear (k?d"b?r`) , noun
[Also cudbeard, corrupted from the name of Dr. Cuthbert Gordon, a Scotchman, who first brought it into notice.]
1.
A powder of a violet red color, difficult to moisten with water, used for making violet or purple dye. It is prepared from certain species of lichen, especially Lecanora tartarea. — Ure
2.
(Botany) A lichen (Lecanora tartarea), from which the powder is obtained.