Source : Webster's Revised Unabridged Dictionary (1913)

Cornflower \Corn"flow`er\ (-flou`?r), n. (Bot.)
   A conspicuous wild flower ({Centaurea Cyanus}), growing in
   grainfields.

Source : WordNet®

cornflower
     n 1: plant of southern and southeastern United States grown for
          its yellow flowers that can be dried [syn: {strawflower},
           {Uvularia grandiflora}]
     2: an annual Eurasian plant cultivated in North America having
        showy heads of blue or purple or pink or white flowers
        [syn: {bachelor's button}, {bluebottle}, {Centaurea cyanus}]