Blue·bot·tle, blue-bottle n.
1. Bot. an annual Eurasian plant (Centaurea cyanus) which grows in grain fields; -- called also bachelor's button. It receives its name from its blue bottle-shaped flowers. Varieties cultivated in North America have showy heads of blue or purple or pink or white flowers
Syn: -- cornflower, bachelor's button.
2. Zool. A large and troublesome species of blowfly (Musca vomitoria). Its body is steel blue.
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