: any of various chiefly North American weedy composite herbs (genus Ambrosia) that produce highly allergenic pollen
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Growing up in the South with pollen and ragweed didn't make matters any better.—Gaylyn Henderson, Mph, Health, 25 Jan. 2025 The most common culprit for fall allergies is a plant called ragweed, the CDC says, which can release 1 billion grains of pollen per plant.—Alexandra Banner, CNN, 22 Oct. 2024 September and October are known for ragweed season and pollen from some fall trees.—Nicole Villalpando, Austin American-Statesman, 5 Dec. 2024 Pollen counts have been high in Houston, largely due to ragweed season.—Shafaq Patel, Axios, 18 Sep. 2024 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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