: any of various chiefly North American weedy composite herbs (genus Ambrosia) that produce highly allergenic pollen
Illustration of ragweed
Examples of ragweed in a Sentence
Recent Examples on the WebOnce Daily Relief targets itchy eyes and other allergic symptoms caused by grass, pollen, ragweed, and animals, like Bausch + Lomb Alaway Antihistamine Eye Drops.—Sarah Bradley, Verywell Health, 30 Oct. 2023 After entering the start and end destination, the tool populates the lowest pollution route based on the real-time Air Quality Index (AQI) and levels of common pollens, such as ash, grass and ragweed.—Julia Jacobo, ABC News, 18 Sep. 2023 As most people know, the late summer instigator of late-season allergic rhinitis is ragweed (Ambrosia artimisiifolia), with its bloom time that overlaps with many goldenrods but does so fully camouflaged in green flowers.—Paul Cappiello, The Courier-Journal, 2 Sep. 2023 Grass, ragweed, and tree pollens are typically elevated during cooler nights.11
Time of Day That Allergies Peak
A person may have more issues with allergy symptoms during certain parts of the day, depending on their allergy type.—Sarah Klein, Health, 31 Aug. 2023 The giant ragweed makes dark corridors down to the stream, and the pipevine smothers the leaning pergola of shrubs and trees beneath.—Bill Finch, al, 6 Aug. 2023 For example, a child with ragweed allergies will experience sneezing, sniffling, and itchy eyes each fall.—Nicole Harris, Parents, 10 Sep. 2023 Children who had animals had fewer positive skin tests to indoor allergens—like pet and dust-mite allergens—and also to outdoor allergens such as ragweed and grass.—Bill Strickland, Parents, 9 Aug. 2023 Pollen, ragweed, or other triggers stimulate immune cells that produce histamine.—Robert H. Shmerling, Chicago Tribune, 2 Aug. 2023 See More
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'ragweed.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
: 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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