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ragweed

[rag-weed] /ˈrægˌwid/
noun
1.
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. artemisiifolia.
Origin
1650-1660
1650-60; rag1 + weed1, so called from its ragged appearance
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for ragweed
  • For example, melon contains substances similar to ragweed pollen, and apples have allergens similar to tree pollen.
  • Injections for ragweed and, sometimes, dust mites have higher risks for side effects than other allergy shots.
  • Thus in a few weeks ragweed plants produce billions of pollen grains, casting them to the winds and to runny noses.
  • Immunotherapy involves subjecting patients to increasing amounts of ragweed or other compounds to which they are allergic.
British Dictionary definitions for ragweed

ragweed

/ˈræɡˌwiːd/
noun
1.
any plant of the chiefly North American genus Ambrosia, such as A. artemisiifolia (common ragweed): family Asteraceae (composites). Their green tassel-like flowers produce large amounts of pollen, which causes hay fever Also called ambrosia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ragweed
ragweed
1790, from ragged + + weed; so called from shape of the leaves. Applied to a different plant, ragwort, from 1650s. Ragwort itself is attested from mid-15c.
Online Etymology Dictionary, © 2010 Douglas Harper
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ragweed in Medicine

ragweed rag·weed (rāg'wēd')
n.
Any of various weeds of the genus Ambrosia having small greenish unisexual flower heads and producing abundant pollen that is one of the chief causes of hay fever.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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