Barnaby's thistle

noun
Bar·​na·​by's thistle | \ ˈbärnəbēz-\

Definition of Barnaby's thistle

: any of several weeds of the genus Centaurea especially : a European herb (C. solstitialis) adventive in the eastern U.S. and having a winged stem and tomentose leaves

History and Etymology for Barnaby's thistle

from Barnaby (day), the time of its flowering

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