Illustration of ragweed
: any of various chiefly North American weedy composite herbs (genus Ambrosia) that produce highly allergenic pollen
Examples of ragweed in a Sentence
Recent Examples on the Web
Having an allergy to plants like ragweed, chrysanthemums, and marigolds may increase your risk of an allergic reaction to dandelion tea.
—
Isabel Vasquez Rd Ldn, Health, 29 Dec. 2025
Goldenrods are commonly blamed for fall allergies, though the true culprit is ragweed.
—Kim Toscano, Southern Living, 27 Oct. 2025
Some of the most popular choices include partridge pea, butterfly pea, ragweed, blackberry, pokeweed and American beautyberry, Edge said.
—Craig Shoup, Nashville Tennessean, 27 Oct. 2025
Because pollen and ragweed persist far longer into the fall, allergy sufferers are among those most immediately affected.
—Janet Loehrke, USA Today, 22 Oct. 2025
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Isabel Vasquez Rd Ldn, Health, 29 Dec. 2025
Goldenrods are commonly blamed for fall allergies, though the true culprit is ragweed.
—Kim Toscano, Southern Living, 27 Oct. 2025
Some of the most popular choices include partridge pea, butterfly pea, ragweed, blackberry, pokeweed and American beautyberry, Edge said.
—Craig Shoup, Nashville Tennessean, 27 Oct. 2025
Because pollen and ragweed persist far longer into the fall, allergy sufferers are among those most immediately affected.
—Janet Loehrke, USA Today, 22 Oct. 2025
See All Example Sentences for ragweed
Cite this Entry
“Ragweed.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ragweed. Accessed 7 Jan. 2026.
Copy CitationKids Definition
ragweed
noun
rag·weed
ˈrag-ˌwēd 
: any of various chiefly North American weedy herbs related to the daisies and producing pollen irritating to the eyes and noses of some persons
Medical Definition
ragweed
noun
rag·weed
ˈrag-ˌwēd
: 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
called also great ragweed
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