ragweed


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rag·weed

 (răg′wēd′)
n.
1. Any of various weeds of the genus Ambrosia of the composite family, having small, greenish, unisexual flower heads and producing abundant pollen that is one of the chief causes of hay fever.
2. Chiefly British Ragwort.

[From the ragged shape of its leaves.]

ragweed

(ˈræɡˌwiːd)
n
(Plants) any plant of the chiefly North American genus Ambrosia, such as A. artemisiifolia (common ragweed): family Asteraceae (composites). Their green tassel-like flowers produce large amounts of pollen, which causes hay fever. Also called: ambrosia

rag•weed

(ˈrægˌwid)

n.
any of the composite plants of the genus Ambrosia, the airborne pollen of which is the most prevalent cause of autumnal hay fever.
[1650–60; so called from its ragged appearance]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ragweed - widespread European weed having yellow daisylike flowersragweed - widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
genus Senecio, Senecio - enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weeds
weed - any plant that crowds out cultivated plants
2.ragweed - any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthmaragweed - any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
genus Ambrosia - comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae
Ambrosia artemisiifolia, common ragweed - annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally
Ambrosia trifida, great ragweed - a coarse annual with some leaves deeply and palmately three-cleft or five-cleft
Ambrosia psilostachya, perennial ragweed, western ragweed - coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
weed - any plant that crowds out cultivated plants
Translations

ragweed

[ˈrægwiːd] Nambrosía f

ragweed

n (bot) ambrosía
References in periodicals archive ?
Fortunately, the same rainy conditions that have stimulated ragweed to produce a potentially bumper crop of pollen have also delayed the opening of the insignificant flowers preventing pollen release.
Ragweed pollen, the most significant cause of allergy, is airborne mainly during August and September, report researchers at the University of Medicine and Dentistry of New Jersey-New Jersey Medical School in Newark.
The researchers directly compared the two agents in a 2-week study of 58 patients with ragweed allergy.
AMBROSIA: Seller's favorite hay fever quick fix comes from an unlikely source: the same ragweed that inflames so many noses.
The device could even work its way into homes, smelling concentrations of allergy-causing ragweed or chemicals given off by the bacteria that make bacon go bad.
Inclusion criteria were as follows: a diagnosis of seasonal allergic rhinoconjunctivitis; troublesome nasal symptoms requiring medication during the ragweed pollen season; positive skin-prick test to ragweed pollen extract; no perennial rhinoconjunctivitis requiring treatment; no chronic nasal obstruction, polyposis or sinusitis; no history of allergen injection therapy in the previous 12 months; and no serious illness that might impair quality of life.
There have been a few guesses, from ragweed to wild parsley, but no one can be sure.
Unhealthy levels of smog and ragweed pollen, which are results of climate change, have put millions of people at risk of irritated eyes, noses, and lungs, a recent study said.
1) While SLIT has been used outside the United States for decades, the US Food and Drug Administration (FDA) has recently approved 4 SLIT allergen extract products (tablets) for treatment of the symptoms and morbidity associated with grass pollen, ragweed, or house dust mite AR, with or without conjunctivitis.
1) In this issue of EHP, scientists estimate how changing growth trends in ragweed may affect future pollen allergies in Europe, where the plant is a nonnative invasive weed.
M2 EQUITYBITES-February 16, 2017-ALK's registration application for ragweed SLIT-tablet in Europe accepted for review
M2 PHARMA-February 16, 2017-ALK's registration application for ragweed SLIT-tablet in Europe accepted for review