cornflower /ˈkɔɹnˌflaʊ.ɚ/noun 3adjective 1forms 1 noun3 •A small annual plant in the family Asteraceae, Centaurea cyanus, usually with bushy blue flowers which grows natively in European cornfields (i.e. wheatfields). •A color, cornflower blue. •A plant of the species Cichorium intybus. adjective1 •Synonym of cornflower blue, a shade of blue similar to that of the usual cornflower. formscornflowers