Definition of knapweed in English:

knapweed

Syllabification: knap·weed
Pronunciation: /ˈnapˌwēd
 
/

noun

  • A tough-stemmed plant of the daisy family that typically has purple thistlelike flower heads, occurring typically in grassland and on roadsides.
    • Genus Centaurea, family Compositae: several species, including the widespread black knapweed (C. nigra) (also called hardheads)
    More example sentences
    • The oil from the seeds of cotton thistles was extracted for fuel and knapweed, centaurea scabiosa, was believed to promote healing of bruises and wounds.
    • Currently, most producers apply chemicals on rangeland in spring or summer, when knapweed begins to flower, but research is showing that fall application may be preferable.
    • Spotted knapweed is not killed by fire, but sagebrush is.

Origin

late Middle English (originally as knopweed): from knop (because of its hard rounded involucre or “head”) + weed.

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