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old-man's beard

2 ENTRIES FOUND:
  1. old-man's beard (noun)
  2. old tuberculin (noun)

old–man's beard

noun \ˌōl(d)-ˌmanz-\

Definition of OLD-MAN'S BEARD

: a greenish gray pendulous lichen of the genus Usnea (U. barbata) that grows on trees and is a source of usnic acid