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ragweed

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Ragweed Information
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rag⋅weed

  [rag-weed]
Use ragweed in a Sentence
–noun
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:
1650–60; rag 1 + weed 1 , so called from its ragged appearance
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Ragweed Information
Learn About Ragweed and How it May be Causing Nasal Allergies.
www.Nasal-Allergies.com
Allergy Symptom Relief
Powerful, 24-hour nasal allergy symptom relief.Available by Rx only
www.outdoor-allergy-symptoms.com
rag·weed   (rāg'wēd')   
n.  

  1. 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.

  2. Chiefly British Ragwort.


[From the ragged shape of its leaves.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang Dictionary
ragweed

  1. n.
    inferior marijuana. (Drugs.) : Bart just sells ragweed except to his friends.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Word Origin & History

ragweed 
1790, from ragged (q.v.), so called from shape of the leaves. Applied to a different plant, ragwort, from 1658. Ragwort itself is attested from c.1450.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: rag·weed
Pronunciation: 'rag-"wEd
Function: noun
: any of various chiefly No. American weedy herbaceous plants comprising the genusAmbrosia and producing highly allergenic pollen responsible for much hay fever and asthma: as a : an annual weed (A. artemisiifolia) with finely divided foliage that iscommon on open or cultivated ground in much of No. America b : a coarse annual (A. trifida) with some or all of the leaves usually deeply and palmately 3-cleft or 5-cleft calledalso great ragweed
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

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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