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

First Known Use of old-man's beard

1731

in the meaning defined at sense 1

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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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