Definition of "cornflower"

A small annual plant in the family Asteraceae, Centaurea cyanus, usually with bushy blue flowers which grows natively in European cornfields (i.e. wheatfields).  examples

A plant of the species Cichorium intybus.  examples

A color, cornflower blue.  examples

Synonym of cornflower blue, a shade of blue similar to that of the usual cornflower.  examples