Dictionary

usnea

noun us·nea \ˈəs-nē-ə, ˈəz-\

Definition of USNEA

:  any of a genus (Usnea of the family Usneaceae) of widely distributed lichens (as old-man's beard) that have a grayish or yellow pendulous freely branched thallus

Origin of USNEA

New Latin, from Arabic ushna moss
First Known Use: 1597

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