Any of a number of weedy composite herbs that produce a pollen that is a frequent cause of allergies. Of all allergy sufferers in the United States, 75% are allergic to ragweed.

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rag·weed 'rag-.wēd n any of various chiefly No. 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 No. America
b) a coarse annual (A. trifida) with some or all of the leaves usu. deeply and palmately 3-cleft or 5-cleft called also great ragweed

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rag·weed (ragґwēd) any of various species of plants of the genus Ambrosia whose pollen can cause hay fever.

Medical dictionary. 2011.

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Look at other dictionaries:

  • Ragweed — Rag weed (r[a^]g w[=e]d ), n. (Bot.) A common American composite weed ({Ambrosia artemisi[ae]folia}) with finely divided leaves; hogweed. [1913 Webster] {Great ragweed}, a coarse American herb ({Ambrosia trifida}), with rough three lobed opposite …   The Collaborative International Dictionary of English

  • ragweed — (n.) 1790, from RAGGED (Cf. ragged) + WEED (Cf. weed) (n.); so called from shape of the leaves. Applied to a different plant, ragwort, from 1650s. Ragwort itself is attested from mid 15c. (see WORT (Cf. wort)) …   Etymology dictionary

  • ragweed — ☆ ragweed [rag′wēd΄] n. [from the tattered appearance of the leaves ] any of a genus (Ambrosia) of chiefly North American plants of the composite family, having tassel like, greenish flowers which yield large amounts of wind borne pollen, a major …   English World dictionary

  • Ragweed — Taxobox name = Ragweeds image width = 200px image caption = A ragweed, Ambrosia sp. regnum = Plantae divisio = Magnoliophyta classis = Magnoliopsida subclassis = Asteridae unranked ordo = Euasterids II ordo = Asterales familia = Asteraceae… …   Wikipedia

  • ragweed — /rag weed /, n. any of the composite plants of the genus Ambrosia, the airborne pollen of which is the most prevalent cause of autumnal hay fever, as the common North American species, A. trifida (great ragweed or giant ragweed) and A.… …   Universalium

  • ragweed — kietinė ambrozija statusas T sritis vardynas apibrėžtis Astrinių šeimos vaistinis nuodingas augalas (Ambrosia artemisiifolia), paplitęs Šiaurės Amerikoje. atitikmenys: lot. Ambrosia artemisiifolia angl. annual ragweed; bitterweed; common ragweed; …   Lithuanian dictionary (lietuvių žodynas)

  • ragweed — /ˈrægwid/ (say ragweed) noun 1. any of the herbs constituting the genus Ambrosia, whose airborne pollen is a cause of hay fever, as the common ragweed, A. artemisiifolia. 2. → ragwort. {rag1 + weed1} …  

  • ragweed — n. inferior marijuana. (Drugs.) □ This stuff is ragweed. You can have it! □ Bart just sells ragweed except to his friends …   Dictionary of American slang and colloquial expressions

  • Ragweed — Beifußblättriges Traubenkraut Beifußblättriges Traubenkraut (Ambrosia artemisiifolia) Systematik Ordnung …   Deutsch Wikipedia

  • ragweed pollen — noun pollen of the ragweed plant is a common allergen • Hypernyms: ↑pollen, ↑allergen …   Useful english dictionary

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