cudbear
A violet-red dye powder, prepared from certain lichens, especially Ochrolechia tartarea.
countable, historical, uncountable
ORCHELLA WEEDS. The cylindrical and flat species of Roccella used in the manufacture of Orchil or Archil, and Cudbear, are so called by the makers.
A rim lichen, crabseye lichen (Ochrolechia tartarea.
countable, uncountable
Where it comes from
Corrupted from the name of Dr. Cuthbert Gordon, a Scotsman, who patented the process of manufacture.
Adapted from the Wiktionary entry cudbear (CC BY-SA 4.0).