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  1. operating room a room in a hospital equipped for the performance of surgical operations
  2. drawing room a formal room where visitors can be received and entertained
  3. starting time the time at which something is supposed to begin
  4. operating surgeon a physician who specializes in surgery
  5. Schrodinger equation the fundamental equation of wave mechanics
  6. tracing routine a routine that provides a chronological record of the execution of a computer program
  7. hydraulic ram a water pump that uses the kinetic energy of flowing water to force a small fraction of that water to a reservoir at a higher level
  8. starting gate a movable barrier on the starting line of a race course
  9. starting line a line indicating the location of the start of a race or a game
  10. heating element the component of a heater or range that transforms fuel or electricity into heat
  11. hydrargyrum a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures
  12. vibrating reed a vibrator consisting of a thin strip of stiff material that vibrates to produce a tone when air streams over it
  13. hydrated lime a caustic substance produced by heating limestone
  14. sporting man someone who leads a merry existence
  15. authoritarian regime a government that concentrates political power in an authority not responsible to the people
  16. heterodyne receiver a radio receiver that combines a locally generated frequency with the carrier frequency to produce a supersonic signal that is demodulated and amplified
  17. crab-eating raccoon a South American raccoon
  18. hydrangea family sometimes included in the family Saxifragaceae
  19. starting signal a signal to begin (as in a race)
  20. bedsitting room a furnished sitting room with sleeping accommodations