1. dapsone antibacterial drug used to treat leprosy and some kinds of skin diseases
  2. dobson large soft-bodied insect having long slender mandibles in the male; aquatic larvae often used as bait
  3. diapason either of the two main stops on a pipe organ
  4. drop zone an agreed area where military supplies are dropped to ground troops
  5. Thompson English physicist who studied heat and friction
  6. stepson the son your spouse by a former marriage
  7. Dapsang a mountain peak in the Karakoram Range in northern Kashmir
  8. twopenny of trifling worth
  9. Thomson United States composer who collaborated with Gertrude Stein
  10. topsoil the layer of soil on the surface
  11. damson dark purple plum of the damson tree
  12. poison any substance that causes injury or illness or death
  13. Tucson a city in southeastern Arizona ringed by mountain ranges
  14. Dawson a town in northwestern Canada in the Yukon on the Yukon River; a boom town around 1900 when gold was discovered in the Klondike
  15. monopsony an economic market with several sellers but only one buyer
  16. boson any particle that obeys Bose-Einstein statistics
  17. opsin retinal protein formed by the action of light on rhodopsin
  18. debasing used of conduct; characterized by dishonor
  19. iodopsin a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision
  20. Tibicen harvest flies

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