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usnea

us·ne·a [ ússnee ə, úznee ə ] (plural us·ne·ae [ ússnee  ] or us·ne·as)


noun 
Definition:
 
type of lichen: a common lichen with a hanging body in which the root, stem, and leaf are not distinguished. Genus Usnea.

[Late 16th century. Via modern and medieval Latin< Arabic, Persian ušna "moss, lichen"]
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