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WordReference Random House Unabridged Dictionary of American English © 2024knap•weed (nap′wēd′),USA pronunciation n. - Plant Biologyany composite plant of the genus Centaurea, esp. the weedy C. nigra, having rose-purple flowers set on a dark-colored, knoblike bract. Also called hardheads, Spanish button.
- late Middle English knopwed. See knop, weed1 1400–50
Collins Concise English Dictionary © HarperCollins Publishers:: knapweed /ˈnæpˌwiːd/ n - any of several plants of the genus Centaurea, having purplish thistle-like flowers: family Asteraceae (composites)
Etymology: 15th Century knopwed; see knop, weed1 cen•tau•re•a (sen tôr′ē ə),USA pronunciation n. - Plant Biologyany of numerous composite plants of the genus Centaurea, having tubular flowers in a variety of colors. Cf. cornflower (def. 1), knapweed.
- Neo-Latin (Linnaeus) by suffix change from Medieval Latin centauria; see centaury, -ea
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