a composite plant of the genus Arctium, especially A. lappa, a coarse, broad-leaved weed bearing prickly heads of burs that stick to the clothing.

1590–1600; bur1 + dock4

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World English Dictionary
burdock (ˈbɜːˌdɒk)
a coarse weedy Eurasian plant of the genus Arctium, having large heart-shaped leaves, tiny purple flowers surrounded by hooked bristles, and burlike fruits: family Asteraceae (composites)
[C16: from bur + dock4]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"coarse, weedy plant," 1590s, from bur (q.v.) + dock, name for various tall, coarse weeds, O.E. docce, akin to M.H.G. tocke "bundle, tuft."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The tincture you have in your hands also has burdock in it.
For some people the sting of a nettle plant can be eased by rubbing the affected area with a leaf from a burdock plant.
Burdock is any of a group of biennial thistles in the genus arctium, family asteraceae.
Dandelion and burdock is a soft drink that has long been popular in the united kingdom.
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