Webster's Revised Unabridged Dictionary · 1913

Knapweed

Knapweed , noun

(Botany) The black centaury (Centaurea nigra); -- so called from the knoblike heads of flowers. Called also bullweed.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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