bluebottle

noun

1. cornflower(def 1).
2. a composite plant, Centaurea cyanus, having narrow leaves and blue flower heads.
3. bluebottle fly.
4. Australian. Portuguese man-of-war.

noun

1. another name for the blowfly
2. any of various blue-flowered plants, esp the cornflower
3. British an informal word for a policeman
4. Australian and NZ an informal name for Portuguese man-of-war