1. blue jack small salmon of northern Pacific coasts and the Great Lakes
  2. blue joke an indelicate joke
  3. bluejacket a serviceman in the navy
  4. blackjack a gambling game using cards
  5. blue jay common jay of eastern North America
  6. bluetick a very fast American hound; white mottled with bluish grey
  7. bluejack oak small semi-evergreen shrubby tree of southeastern United States having hairy young branchlets and leaves narrowing to a slender bristly point
  8. blue book a register of persons who are socially prominent
  9. blue jean (usually plural) close-fitting trousers of heavy denim for manual work or casual wear
  10. blue sage sage of western North America to Central America having violet-blue flowers; widespread in cultivation
  11. biologic pertaining to biology or to life and living things
  12. blowback the backward escape of gases and unburned gunpowder after a gun is fired
  13. blue jet atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward
  14. bootjack has V-shaped notch for pulling off boots
  15. applejack distilled from hard cider
  16. black being of the achromatic color of maximum darkness
  17. blue-black of black tinged with blue
  18. Black British chemist who identified carbon dioxide and who formulated the concepts of specific heat and latent heat (1728-1799)
  19. supplejack walking stick made from the wood of an American tropical vine
  20. blue pike variety inhabiting the Great Lakes

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