crotal n 1: any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made [syn: {crottle}, {crottal}, {crotal}]
crotal \crotal\ n. any of several lichens of the genus {Parmelia} from which reddish brown or purple dyes are made. Syn: crottle, crottal. [WordNet 1.5]
crottal \crottal\ n. any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made. [Also spelled {crottle} and {crotal}.] Syn: . [WordNet 1.5]