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nounwidespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
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nounany of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
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Definition that contains ragweed
- perennial ragweed coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
- aster family plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia
- family asteraceae plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia
- pollen count 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
- asteraceae plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia
- family compositae plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia
- ambrosia psilostachya coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
- ragweed pollen pollen of the ragweed plant is a common allergen
- compositae plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia
- genus ambrosia comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae