GNU Collaborative International Dictionary of English

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1.       
   Bluebottle, blue-bottle , n.
   (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.
   1913 Webster
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   WordNet 1.5
   (Zool.) A large and troublesome species of blowfly (Musca vomitoria). Its body is steel blue.
   1913 Webster