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old-man's beard

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Medical Dictionary

Main Entry: old–man's beard
Pronunciation: "Ol(d)-"manz-
Function: noun
: a greenish gray pendulous lichen of the genus Usnea (U.barbata) that grows on trees and is a source of usnic acid
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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