: any of various chiefly North American weedy composite herbs (genus Ambrosia) that produce highly allergenic pollen
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Common types include seasonal allergies (e.g., pollen, ragweed) and environmental allergies (e.g., mold, dust, pet dander).—Lindsay Curtis, Health, 25 Apr. 2025 As a result, grass pollen increasingly overlaps with the ragweed pollen season, which itself has been extended by more than three weeks in some parts of the country since 1995.—Umair Irfan, Wired News, 5 Apr. 2025 While anywhere that there is plant growth is susceptible to various pollens and ragweed, some cities and regions in the United States seem notoriously bad for allergy sufferers.—Laura Baisas, Popular Science, 10 Apr. 2025 Seasonal allergies occur when the immune system interprets certain airborne substances, like ragweed or tree pollen, as a threat and overreacts.—Sarah Cottone, Health, 16 Apr. 2025 See All Example Sentences for ragweed
: any of various chiefly North American weedy herbaceous plants comprising the genus Ambrosia and producing highly allergenic pollen responsible for much hay fever and asthma: as
a
: an annual weed (A. artemisiifolia) with finely divided foliage that is common on open or cultivated ground in much of North America
b
: a coarse annual (A. trifida) with some or all of the leaves usually deeply and palmately 3-cleft or 5-cleft
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