bitterweed


bit·ter·weed

noun \ˈbi-tər-ˌwēd\

Definition of BITTERWEED

:  any of several American plants containing a bitter substance: as
a :  either of two ragweeds:
(1) :  a low-growing common ragweed (Ambrosia artemissiifolia) (2) :  horseweed
b :  an annual yellow-flowered sneezeweed (Helenium amarum syn. H. tenuifolium)
c :  an erect annual composite herb (Hymenoxys odorata) of the southwestern United States that has yellow flowers and is poisonous to livestock

First Known Use of BITTERWEED

1819

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