BLUEBOTTLE
bluebottle, Calliphora vicina
(noun) blowfly with iridescent blue body; makes a loud buzzing noise in flight
cornflower, bachelor's button, bluebottle, Centaurea cyanus
(noun) an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers
Source: WordNet® 3.1
Etymology
Noun
bluebottle (plural bluebottles)
Any of various blowflies of the genus Calliphora that have an iridescent metallic-blue body and make a loud buzzing noise when flying.
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.
A cornflower, a plant that grows in grain fields, Centaurea cyanus, with blue flowers resembling bottles.
A blue ant, Diamma bicolor, a parasitic wasp native to Australia.
Any of various large papilionid butterflies of the genus Graphium. Also called triangles.
(UK, AU, Ireland, slang, derogatory) A police officer.
Source: Wiktionary
Blue"bot`tle, n.
1. (Bot.)
Definition: A plant (Centaurea cyanus) which grows in grain fields. It
receives its name from its blue bottle-shaped flowers.
2. (Zoöl.)
Definition: A large and troublesome species of blowfly (Musca vomitoria).
Its body is steel blue.
Source: Webster’s Unabridged Dictionary 1913 Edition