ragweed pollen
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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
pollen count — n. the number of grains of a specified variety of pollen, usually ragweed, present in a given volume of air, usually a cubic yard, at a specified time and place … English World 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
Pollen — Tip of a tulip stamen with many grains of pollen Closeup image of a cac … 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
pollen — pollenless, adj. pollenlike, adj. pollinic /peuh lin ik/, pollinical, adj. /pol euhn/, n. 1. the fertilizing element of flowering plants, consisting of fine, powdery, yellowish grains or spores, sometimes in masses. v.t. 2. to pollinate. [1515… … Universalium
Ragweed — Beifußblättriges Traubenkraut Beifußblättriges Traubenkraut (Ambrosia artemisiifolia) Systematik Ordnung … Deutsch Wikipedia
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
pollen count — noun the number of pollen grains (usually ragweed) in a standard volume of air over a twenty four hour period and a specified time and place • Hypernyms: ↑count * * * noun, pl ⋯ counts [count] : a number that indicates the amount of pollen in the … Useful english 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} …
