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The Collaborative International Dictionary
Ragweed

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.

Great ragweed, a coarse American herb ( Ambrosia trifida), with rough three-lobed opposite leaves.

Douglas Harper's Etymology Dictionary
ragweed

1790, from ragged + weed (n.); so called from shape of the leaves. Applied to a different plant (ragwort) from 1650s.

Wiktionary
ragweed

n. A plant of the genus ''Ambrosia''. These weeds are particularly noted for producing pollen which people with hay fever are allergic to.

WordNet
ragweed
  1. n. widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity [syn: ragwort, tansy ragwort, benweed, Senecio jacobaea]

  2. any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma [syn: ambrosia, bitterweed]

Wikipedia
Ragweed

Ragweeds are flowering plants in the genus Ambrosia in the aster family, Asteraceae. They are distributed in the tropical and subtropical regions of the New World, especially North America, where the origin and center of diversity of the genus are in the southwestern United States and northwestern Mexico. Several species have been introduced to the Old World and some have naturalized.

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.

Usage examples of "ragweed".

His nose was sniffly from May until July, then again during ragweed season at the end of August.

But those times were like a lost paradise, and the sprawly corrals around the place now stood near empty and growing over in ragweed.

The outlying fields grew first garish with golden ragweed and scarlet poppies, and then dull green again with the brown-knotted rushes and sombre sedge, and all other marish growths, until the re-annexation was complete, and they once more were homogeneous part and parcel of the conquering bog.

Isaac had been sent to watch, overran the garden and demolished everything but the purslane and ragweed, while all the time the young man was under the hedge working out mathematical problems from his Descartes.

A fringe of ragweeds and Russian thistle growing in its dirt roof gave it a disreputable, unshaven look.

Don and I were late bloomers physically, puny until we graduated from grammar school after which we shot up like ragweed plants in July.

Worse yet, sumpweed is a wind-pollinated relative of ragweed, the notorious hayfever-causing plant.