any of various plants containing a bitter principle, as those of the genus Picris.
a sneezeweed, Helenium amarum.

1810–20, Americanism; bitter + weed1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bitterweed (ˈbɪtəˌwiːd)
any of various plants that contain a bitter-tasting substance

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Bitterweed, however, produces honey that is soapy to the taste.
Bitterweed is a yellow-flowered annual weed varying in height from a few cm up to a meter.
It has not become a problem in pastures, and it requires more moisture than the bitterweed, so it will not grow on droughty sites.
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