Definition of bitterweed
: any of several American plants containing a bitter substance: such asa : either of two ragweeds: (1) : a low-growing common ragweed (Ambrosia artemissiifolia) (2) : horseweedb : an annual yellow-flowered sneezeweed (Helenium amarum synonym H. tenuifolium)c : an erect annual composite herb (Hymenoxys odorata) of the southwestern U.S. that has yellow flowers and is poisonous to livestock
First Known Use of bitterweed
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