Definition of Parmelia
: a large genus (the type of the family Parmeliaceae) of chiefly alpine foliaceous lichens having cortex on both surfaces of a closely appressed thallus and including several that are important sources of purple and brown dyestuffs especially in Scotland, Wales, and Scandinavia — see crottle
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Origin and Etymology of parmelia
New Latin, probably irregular from Latin parma small shield
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