rag·​weed | \ ˈrag-ˌwēd How to pronounce ragweed (audio) \

Definition of ragweed

: any of various chiefly North American weedy composite herbs (genus Ambrosia) that produce highly allergenic pollen

Illustration of ragweed

Illustration of ragweed

Examples of ragweed in a Sentence

Recent Examples on the Web Case’s 2018 study names upstate New York and New England as prime areas for ragweed expansion. Meryl Davids Landau, Good Housekeeping, "5 Ways to Protect the Planet and Your Own Health," 15 Apr. 2021 According to Rent-A-Ruminant Texas, these breeds are all effective at reducing brush overgrowth, green briars, poison ivy, ragweed and other undesirable plant species. Ryan Nickerson, Houston Chronicle, "Houston Arboretum bringing in more than 120 goats next month," 15 Sep. 2020 Weed pollen is low/moderate, as ragweed begins to pick up. Ian Livingston, Washington Post, "PM Update: Some showers around during the first half of a cooler Wednesday," 18 Aug. 2020 Already, there are low amounts of ragweed in the air in Cleveland, according to the Academy of Medicine of Cleveland and Northeast Ohio. Mary Kilpatrick, cleveland, "Ragweed season is coming to Northeast Ohio," 2 Aug. 2020 Grass pollen starts to pick up in April and May, and then high ragweed counts will start to appear in September. Rebecca Hennes, Houston Chronicle, "Houston ranked No. 1 for highest pollen counts in the country," 5 Mar. 2020 But as much as the common ragweed loves to grow, Ophraella communa loves to devour it. Matt Simon, Wired, "This Hungry Little Beetle Could Help Ease Seasonal Allergies," 23 Apr. 2020 In China, the bug is mass-reproduced and actively distributed to control the spread of ragweed. Katie Hunt, CNN, "How this tiny beetle could help millions of allergy sufferers," 21 Apr. 2020 What's more, a 2010 study conducted by the Asthma and Allergy Foundation of America found that ragweed (another source of pollen) releases more pollen at higher carbon dioxide concentrations. Alex Schwartz, Popular Science, "Megapixels: North Carolina’s ‘Pollenpocalypse’ is nothing to sneeze at—but you will anyway," 11 Apr. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ragweed.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ragweed

1790, in the meaning defined above

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Time Traveler for ragweed

Time Traveler

The first known use of ragweed was in 1790

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Last Updated

27 Apr 2021

Cite this Entry

“Ragweed.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ragweed. Accessed 7 May. 2021.

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More Definitions for ragweed



English Language Learners Definition of ragweed

: any one of a group of North American plants that release a lot of pollen into the air and that can cause allergic reactions in some people


rag·​weed | \ ˈrag-ˌwēd How to pronounce ragweed (audio) \

Kids Definition of ragweed

: a common weed with pollen that irritates the eyes and noses of some people


rag·​weed | \ ˈrag-ˌwēd How to pronounce ragweed (audio) \

Medical Definition of 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

called also great ragweed

More from Merriam-Webster on ragweed

Nglish: Translation of ragweed for Spanish Speakers

Britannica.com: Encyclopedia article about ragweed

Comments on ragweed

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