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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Tree·beard n. Bot. A pendulous branching lichen (Usnea barbata); -- so called from its resemblance to hair.
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From: WordNet (r) 2.0

 Usnea barbata
      n : greenish gray pendulous lichen growing on trees [syn: beard
           lichen, beard moss]