1. Pyrrhic victory a victory that is won by incurring terrible losses
  2. prime factor the prime factors of a quantity are all of the prime quantities that will exactly divide the given quantity
  3. prefecture the district administered by a prefect
  4. perfecter a skilled worker who perfects something
  5. certificatory serving to certify or endorse authoritatively
  6. verificatory serving to support or corroborate
  7. perfunctory hasty and without attention to detail; not thorough
  8. provocateur a secret agent who incites persons to commit illegal acts
  9. precatory expressing entreaty or supplication
  10. predictor information that supports a probabilistic estimate of future events
  11. think factory a company that does research for hire and issues reports on the implications
  12. brain doctor a medical specialist in the nervous system and the disorders affecting it
  13. car factory a factory where automobiles are manufactured
  14. prospector someone who explores an area for mineral deposits
  15. protractor drafting instrument used to draw or measure angles
  16. projector an optical device for projecting a beam of light
  17. protector a person who cares for persons or property
  18. purgatory a temporary state of the dead in Roman Catholic theology
  19. refectory a communal dining-hall, usually in a monastery
  20. Rh factor a blood group antigen possessed by Rh-positive people

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