单词 | knapweed |
释义 | knapweed /nap"weed'/, n. any 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. [1400-50; late ME knopwed. See KNOP, WEED1] |
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