1. blue joke an indelicate joke
  2. blue jack small salmon of northern Pacific coasts and the Great Lakes
  3. blue pike variety inhabiting the Great Lakes
  4. bluejacket a serviceman in the navy
  5. blue book a register of persons who are socially prominent
  6. blue jay common jay of eastern North America
  7. blue jean (usually plural) close-fitting trousers of heavy denim for manual work or casual wear
  8. bloke a boy or man
  9. blue sage sage of western North America to Central America having violet-blue flowers; widespread in cultivation
  10. blue sky the sky as viewed during daylight
  11. bluetick a very fast American hound; white mottled with bluish grey
  12. blue jet atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward
  13. blue-sky without immediate commercial value
  14. Belgique a monarchy in northwestern Europe
  15. bludgeon a club used as a weapon
  16. pelagic relating to, occurring in, or living in the open ocean
  17. biologic pertaining to biology or to life and living things
  18. bluejack oak small semi-evergreen shrubby tree of southeastern United States having hairy young branchlets and leaves narrowing to a slender bristly point
  19. bluegill important edible sunfish of eastern and central United States
  20. blueing a process that makes something blue (or bluish)