knap·weed

[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

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World English Dictionary
knapweed (ˈnæpˌwiːd) [Click for IPA pronunciation guide]
 
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
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00:10
Knapweed is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
Spotted knapweed has few natural enemies and is not preferred by livestock as forage.
Spotted knapweed has a bitter taste, but is sometimes grazed by deer.
Spotted knapweed is a biennial or short-lived perennial forb of the composite family.
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