knapweed

[nap-weed]
noun
any composite plant of the genus Centaurea, especially the weedy C. nigra, having rose-purple flowers set on a dark-colored, knoblike bract.
Also called hardheads, Spanish button.


Origin:
1400–50; late Middle English knopwed. See knop, weed1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To knapweed
Collins
World English Dictionary
knapweed (ˈnæpˌwiːd)
 
n
centaury See also hardheads any of several plants of the genus Centaurea, having purplish thistle-like flowers: family Asteraceae (composites)
 
[C15 knopwed; see knop, weed1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Example sentences
Spotted knapweed has few natural enemies and is not preferred by livestock as forage.
Spotted knapweed is a biennial or short-lived perennial forb of the composite family.
Spotted knapweed has a bitter taste, but is sometimes grazed by deer.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature