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Definition of Crotal
1. Noun. Any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made.
Exact synonyms: Crottal, Crottle
Generic synonyms: Lichen
Group relationships: Genus Parmelia, Parmelia
Generic synonyms: Lichen
Group relationships: Genus Parmelia, Parmelia
Definition of Crotal
1. a type of lichen [n -S]