We found 2 definitions of crotal from 2 different sources.
Noun |
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crotal - any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made | ||
crottle, crottal | ||
lichen any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc. |