rōˈchelə noun
Usage: capitalized
Etymology: New Latin, from Italian, archil (plant), alteration of oricello
: 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
• roc·cel·line -elə̇n, -eˌlīn adjective