Burdock definitions

bûr'dŏk'
Any of several plants of the genus Arctium of the composite family, having edible roots and pink or purplish flower heads surrounded by prickly bracts that form burs.
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Any of several plants (genus Arctium) of the composite family, with large basal leaves and purple-flowered heads covered with hooked prickles.
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Any of the species of biennial thistles in the genus Arctium.
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Origin of burdock

bur +‎ dock