ragweed

[n] - any 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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Ragweed

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.
Found on http://www.medterms.com/script/main/art.asp?articlekey=5199

Ragweed

Rag'weed` (răg'wēd`) noun (Botany) A common American composite weed ( Ambrosia artemisi√¶folia ) with finely divided leaves; hogweed. Great ragweed , a coarse American herb ( Ambrosia trifida ), with rough three-lobed opposite leaves.
Found on http://www.encyclo.co.uk/webster/R/6

ragweed

noun any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
Found on https://www.encyclo.co.uk/local/20974

Ragweed

• (n.) A common American composite weed (Ambrosia artemisiaefolia) with finely divided leaves; hogweed.
Found on http://thinkexist.com/dictionary/meaning/ragweed/

ragweed

(genus Ambrosia), any of a group of about 40 species of weedy plants of the family Asteraceae. Most species are native to North America. The ragweeds ... [2 related articles]
Found on http://www.britannica.com/eb/a-z/r/6

Ragweed

Ragweed is slang for cannabis.
Found on http://www.probertencyclopaedia.com/browse/ZR.HTM

ragweed

ragweed, any plant of the genus Ambrosia, coarse, weedy herbs belonging to the family Asteraceae (aster family), most of which are native to America. They have inconspicuous greenish flowers and soft subdivided leaves. Ragweeds are regarded as especially troublesome because their pollen is acknowled...
Found on http://www.infoplease.com/ce6/sci/A0840977.html

Ragweed

Other common names include bursages and burrobrushes. The genus name is from the Greek ambrosia, the `food of the gods.` Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic rhinitis. Up to half of all cases of pollen-related allergic rhinitis in North America are caused by ragweeds. ==Description and ecolo.....
Found on http://en.wikipedia.org/wiki/Ragweed
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