Any one of a number of plants with daisylike, button shaped flowers of the genus Centaurea, especially the species Centaurea cyanus.
A button which may be attached to clothing without resorting to needle and thread.
A small annual plant in the family Asteraceae, Centaurea cyanus, usually with bushy blue flowers which grows natively in European cornfields (i.e. wheatfields).
Cornflower blue.
A plant of the species Cichorium intybus.
Of a blue colour, as that of the cornflower; cornflower blue.