usnea

[uhs-nee-uh]
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noun

any pale-green or gray, mosslike lichen of the genus Usnea, common on rocks and trees.

Origin of usnea

1590–1600; < New Latin, Medieval Latin < Arabic or Persian ushnah
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of usnea