1. Tanganyika the longest lake in the world in central Africa between Tanzania and Congo in the Great Rift Valley
  2. tank car a freight car that transports liquids or gases in bulk
  3. stinging hair a multicellular hair in plants like the stinging nettle that expels an irritating fluid
  4. Duncan Grant Scottish painter
  5. doppelganger a ghostly double that haunts its living counterpart
  6. donkey cart a cart with an underslung axle and two seats
  7. tree kangaroo arboreal wallabies of New Guinea and northern Australia having hind and forelegs of similar length
  8. doorknocker a device attached by a hinge to a door
  9. tongue-in-cheek cleverly amusing in tone
  10. incongruous lacking in harmony or compatibility or appropriateness
  11. longanberry tree of southeastern Asia to Australia grown primarily for its sweet edible fruit resembling litchi nuts; sometimes placed in genera Euphorbia or Nephelium
  12. skin care care for the skin
  13. donkey engine a locomotive for switching rolling stock in a railroad yard
  14. dengue fever an infectious disease of the tropics transmitted by mosquitoes and characterized by rash and aching head and joints
  15. toboggan cap a close-fitting woolen cap
  16. technocrat an advocate of technocracy
  17. thinking cap a state in which one thinks
  18. dry gangrene (pathology) gangrene that develops in the presence of arterial obstruction and is characterized by dryness of the dead tissue and a dark brown color
  19. design criteria criteria that designers should meet in designing some system or device
  20. Indian cobra a cobra of tropical Africa and Asia