giant ragweed


noun

See under ragweed.

Nearby words

  1. giant peacock moth,
  2. giant petrel,
  3. giant planet,
  4. giant powder,
  5. giant puffball,
  6. giant redwood,
  7. giant reed,
  8. giant scallop,
  9. giant schnauzer,
  10. giant sequoia

ragweed

[rag-weed]

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 of ragweed

1650–60; rag1 + weed1, so called from its ragged appearance

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for giant ragweed

ragweed

noun

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 feverAlso 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

Word Origin and History for giant ragweed

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

Medicine definitions for giant ragweed

ragweed

[răgwēd′]

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.