noun Date: 1790 any of various chiefly North American weedy composite herbs (genus Ambrosia) that produce highly allergenic pollen

New Collegiate Dictionary. 2001.

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  • 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 — 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. * * * rag·weed rag .wēd n any of various chiefly No. American weedy… …   Medical dictionary

  • 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} …   Australian English dictionary

  • 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

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