What is the meaning 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).

A plant of the species Cichorium intybus.

A color, cornflower blue.

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

Source: wiktionary.org