1. black sally a small mallee with rough dark-colored bark toward the butt
  2. blackball vote against; refuse to endorse; refuse to assent
  3. black calla ornamental plant of Middle East cultivated for its dark purple spathe
  4. blackmail extortion of money by threats to divulge harmful information
  5. black mallee a small mallee with rough dark-colored bark toward the butt
  6. Black Hills mountains in southwestern South Dakota and northeastern Wyoming; sacred to the Sioux (whites settling in the Black Hills led to the Battle of Little Bighorn); site of Mount Rushmore
  7. black sage an aromatic plant with wooly leaves found in southern California and Mexico
  8. black fly small blackish stout-bodied biting fly having aquatic larvae
  9. blacktail mule deer of western Rocky Mountains
  10. blackpoll North American warbler having a black-and-white head
  11. blackfly small blackish stout-bodied biting fly having aquatic larvae
  12. black hole a region of space resulting from the collapse of a star
  13. black wattle Australian tree that yields tanning materials
  14. black willow North American shrubby willow having dark bark and linear leaves growing close to streams and lakes
  15. black salsify perennial south European herb having narrow entire leaves and solitary yellow flower heads and long black edible roots shaped like carrots
  16. black bile a humor that was once believed to be secreted by the kidneys or spleen and to cause sadness and melancholy
  17. black swan large Australian swan having black plumage and a red bill
  18. black whale small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school
  19. black opal a dark colored opal with internal reflections of green or red
  20. blackseed grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus