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Definition of Crottle
1. Noun. Any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made.
Exact synonyms: Crotal, Crottal
Generic synonyms: Lichen
Group relationships: Genus Parmelia, Parmelia
Generic synonyms: Lichen
Group relationships: Genus Parmelia, Parmelia
Definition of Crottle
1. crotal [n -S] - See also: crotal
Medical Definition of Crottle
1. Purple-red colouring agent derived from the lichen Ochrolechia tartarea (family Lecanoraceae) and for the colouring principles from Roccellaceae used for colouring liquid pharmaceutical preparations. Synonym: crottle. (05 Mar 2000)