1. prerequisite something that is needed or obligatory in advance
  2. barium peroxide a white toxic powder obtained by heating barium oxide in air
  3. barium hydroxide white poisonous crystals
  4. parametritis inflammation of connective tissue adjacent to the uterus
  5. permutableness ability to change sequence
  6. prerogative a right reserved exclusively by a person or group
  7. prematureness the state of being premature
  8. Permian period from 280 million to 230 million years ago; reptiles
  9. Bermuda shorts short pants that end at the knee
  10. perquisite an incidental benefit for certain types of employment
  11. order Equisetales lower tracheophytes in existence since the Devonian
  12. permutability ability to change sequence
  13. order Primates an animal order including lemurs and tarsiers and monkeys and apes and human beings
  14. chamber orchestra small orchestra; usually plays classical music
  15. parametric statistic any statistic computed by procedures that assume the data were drawn from a particular distribution
  16. permafrost ground that is permanently frozen
  17. spermatogenesis development of spermatozoa
  18. white prairie aster perennial of western North America having white flowers
  19. perboric acid a form of boric acid
  20. formidable extremely impressive in strength or excellence