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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The first known use of old-man's beard was in 1731

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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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occurring twice a year or every two years

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