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. dubious fraught with uncertainty or doubt
  5. drop zone an agreed area where military supplies are dropped to ground troops
  6. Thompson English physicist who studied heat and friction
  7. stepson the son your spouse by a former marriage
  8. treason a crime that undermines the offender's government
  9. poison any substance that causes injury or illness or death
  10. Dapsang a mountain peak in the Karakoram Range in northern Kashmir
  11. topsoil the layer of soil on the surface
  12. twopenny of trifling worth
  13. Thomson United States composer who collaborated with Gertrude Stein
  14. damson dark purple plum of the damson tree
  15. Tucson a city in southeastern Arizona ringed by mountain ranges
  16. monopsony an economic market with several sellers but only one buyer
  17. debasing used of conduct; characterized by dishonor
  18. boson any particle that obeys Bose-Einstein statistics
  19. dipsomania an intense persistent desire to drink alcoholic beverages to excess
  20. opsin retinal protein formed by the action of light on rhodopsin