1. water parting a ridge of land that separates two adjacent river systems
  2. play reading performance of a play by a group of readers
  3. reverberating characterized by resonance
  4. prayer meeting a service at which people sing hymns and pray together
  5. roller bearing bearings containing small metal balls
  6. bareboating boating by chartering a bareboat and providing your own crew and provisions
  7. imperative requiring attention or action
  8. black operation a covert operation not attributable to the organization carrying it out
  9. preponderating having superior power or influence
  10. weatherboarding a long thin board with one edge thicker than the other
  11. player piano a mechanically operated piano that uses a roll of perforated paper to activate the keys
  12. reporting the news as presented by reporters for newspapers or radio or television
  13. flashboarding boarding place along the top of a dam to increase its height
  14. air-breathing deriving oxygen from the air
  15. interpreting an explanation of something that is not immediately obvious
  16. lipreading perceiving what a person is saying by observing the movements of the lips
  17. permeating spreading or spread throughout
  18. preoperative happening or done before and in preparation for a surgical operation
  19. operating involved in a kind of operation
  20. boolean operation an operation that follows the rules of Boolean algebra