Knapweed definition
Any of various weedy thistlelike plants in the composite family having flowers grouped in a head with a spiny involucre, especially several species of the genus Centaurea and the Eurasian species Acroptilon repens.
noun
Any of several weedy plants (genus Centaurea) of the composite family; esp., a hardy perennial (C. nigra) with heads of rose-purple flowers.
noun
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Alternative Forms
Alternative Form of knapweed -
knopweed
Other Word Forms
Noun
Singular:
knapweed
Plural:
knapweeds