Bachelor-s-button definitions

Any of several plants that have buttonlike flowers or flower heads.
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Any of several plants of a genus (Centaurea) of the composite family, that have scaly, vase-shaped bracts below the white, pink, or blue flowers; esp., the cornflower and knapweed.
noun
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Any one of a number of plants with daisylike, button shaped flowers of the genus Centaurea, especially the species Centaurea cyanus.
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A button which may be attached to clothing without resorting to needle and thread.
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