noun

1. Any of various blowflies of the genus Calliphora that have an iridescent metallic-blue body and make a loud buzzing noise when flying.

2. A marine jellyfish of the genus Physalia, which includes Physalia physalis, the Portuguese man-of-war, and Physalia utriculus, the Pacific man-of-war; a man-of-war.

3. A cornflower, a plant that grows in grain fields, Centaurea cyanus, with blue flowers resembling bottles.