old-man's beard
noun
\ ˈōl(d)-ˈmanz-
\
\
Definition of old-man's beard
1
: any of several clematises (especially Clematis vitalba) having plumose styles
2
: a greenish-gray pendulous lichen (Usnea barbata) growing on trees
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More Definitions for old-man's beard
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