crottle
noun
crot·tle
variants or less commonly crottal or crotal
ˈkrätᵊl
plural -s
Scottish
: any of several lichens from which dyes are made
especially : a member of the genus Parmelia that yields reddish brown or purple dye —often used in plural
Word History
Etymology
Scottish Gaelic crotal; akin to Irish Gaelic crotal kernel, rind, crottle