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(Textiles) Scot any of various lichens used in dyeing wool, esp for the manufacture of tweeds
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|Noun||1.||crotal - any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made|
lichen - any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.