[hawg-weed, hog-]
any coarse weed with composite flower heads, especially the cow parsnip.

1700–10; hog + weed1

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World English Dictionary
hogweed (ˈhɒɡˌwiːd)
See also giant hogweed any of several coarse weedy umbelliferous plants, esp cow parsnip

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1707, from hog + weed, used in different places of various plants eaten by hogs or deemed fit only for them.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Unable to identify one plant growing on his doorstep, he leaves it alone and lets it grow: it turns out to be a giant hogweed.
Serial killers and giant hogweed would seem to have little in common.
Spread the word to friends and neighbors about giant hogweed.
Hogweed scars remain sensitive to sunlight for several years.
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