Illustration of ragweed
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: any of various chiefly North American weedy composite herbs (genus Ambrosia) that produce highly allergenic pollen
Example Sentences
Recent Examples on the Web Longer summers could also cause some plants — including ragweed, which is common in Massachusetts — to release pollen for 19 extra days. 
Globe Staff, BostonGlobe.com, 22 Mar. 2022 There are other allergens that have similar seasonal effects, such as ragweed and other grasses that come in the summer and fall months every year. Timothy Fanning, San Antonio Express-News, 17 Dec. 2021 While the original book’s stories are the better of the two, Centerburg Tales has its own moments of fun, from the giant ragweed trees to the mysterious song no one can stop singing. Sarah Schutte, National Review, 25 Apr. 2021 Case’s 2018 study names upstate New York and New England as prime areas for ragweed expansion. Meryl Davids Landau, Good Housekeeping, 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, 15 Sep. 2020 Weed pollen is low/moderate, as ragweed begins to pick up. Ian Livingston, Washington Post, 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, 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, 5 Mar. 2020 See More
Globe Staff, BostonGlobe.com, 22 Mar. 2022 There are other allergens that have similar seasonal effects, such as ragweed and other grasses that come in the summer and fall months every year. Timothy Fanning, San Antonio Express-News, 17 Dec. 2021 While the original book’s stories are the better of the two, Centerburg Tales has its own moments of fun, from the giant ragweed trees to the mysterious song no one can stop singing. Sarah Schutte, National Review, 25 Apr. 2021 Case’s 2018 study names upstate New York and New England as prime areas for ragweed expansion. Meryl Davids Landau, Good Housekeeping, 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, 15 Sep. 2020 Weed pollen is low/moderate, as ragweed begins to pick up. Ian Livingston, Washington Post, 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, 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, 5 Mar. 2020 See More Word History
First Known Use
1790, in the meaning defined above
Time Traveler
The first known use of ragweed was in 1790 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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