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great ragweed

noun
1.
See under ragweed.

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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for great rag-weed

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 great rag-weed

ragweed

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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great rag-weed 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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