Definition of Roccella
: a genus (the type of the family Roccellaceae) of chiefly maritime rock-inhabiting lichens that have a fruticulose or pendulous thallus and include some (especially Roccella tinctoria) which are the chief sources of the dye archil and some which furnish litmus — compare lecanora pertusaria
roccelline\-elə̇n, -eˌlīn\ adjective
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Origin and Etymology of roccella
New Latin, from Italian, archil (plant), alteration of oricello
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