Medical Dictionary

old–man's beard

noun \ˌōl(d)-ˌmanz-\

Medical 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

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May 26, 2015
sacrilegious Hear it
grossly irreverent
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