1. blue jay common jay of eastern North America
  2. blue jack small salmon of northern Pacific coasts and the Great Lakes
  3. bilges in a vessel with two hulls, an enclosed area between the frames at each side
  4. blue daisy hairy South African or Australian subshrub that has daisylike flowers with blue rays
  5. blue joke an indelicate joke
  6. blue jean (usually plural) close-fitting trousers of heavy denim for manual work or casual wear
  7. blue sage sage of western North America to Central America having violet-blue flowers; widespread in cultivation
  8. blueness blue color or pigment
  9. blues a state of depression
  10. blue jet atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward
  11. blue goose North American wild goose having dark plumage in summer but white in winter
  12. bluegrass any of various grasses of the genus Poa
  13. Bluegrass an area in central Kentucky noted for it bluegrass and thoroughbred horses
  14. blue cheese cheese containing a blue mold
  15. bluegill important edible sunfish of eastern and central United States
  16. biology the science that studies living organisms
  17. bluenose a native or inhabitant of Nova Scotia
  18. Pelagius a British or Irish monk who denied the doctrines of original sin and predestination and defended human goodness and free will; his views were declared heretical by the Council of Ephesus in 431 (circa 360-418)
  19. bulginess the property possessed by a rounded convexity
  20. blue grass any of various grasses of the genus Poa