1. black knot disease of plum and cherry trees characterized by black excrescences on the branches
  2. blacken out darken completely
  3. blackened darkened by smoke
  4. black kite dark Old World kite feeding chiefly on carrion
  5. blood knot a knot used for tying fishing leaders together
  6. black cat large dark brown North American arboreal carnivorous mammal
  7. black walnut North American walnut tree with hard dark wood and edible nut
  8. blackguard someone who is morally reprehensible
  9. black economy a hidden sector of the economy where private cash transactions go unreported
  10. Black Hand a secret terrorist society in the United States early in the 20th century
  11. block grant a grant of federal money to state and local governments to support social welfare programs
  12. black spot any of several fungous diseases of plants that produce small black spots on the plant
  13. black knapweed a weedy perennial with tough wiry stems and purple flowers
  14. bowline knot a loop knot that neither slips nor jams
  15. black currant widely cultivated current bearing edible black aromatic berries
  16. black-coated coated with black
  17. black rot a fungous disease causing darkening and decay of the leaves of fruits and vegetables
  18. Blackfoot a member of a warlike group of Algonquians living in the northwestern plains
  19. black comedy comedy that uses black humor
  20. black cottonwood North American poplar with large rounded scalloped leaves and brownish bark and wood