Definition of blue poppy in US English:

blue poppy

noun

  • 1The cornflower, Centaurea cyanus (rare).

  • 2Any of several blue-flowered plants of the genus Meconopsis from the Himalayas; especially (more fully "Himalayan blue poppy") M. betonicifolia and M. grandis, which are grown as ornamentals.

Origin

Late 15th century; earliest use found in Synonyma Herbarium.