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from the GNU version of the Collaborative International Dictionary of English

  • adj. See under Pressure.
  • n. pressure which resists the motion of the piston, as the pressure of exhaust steam which does not find free outlet.

from The Century Dictionary and Cyclopedia

  • n. Pressure backward or in the reverse of the normal direction; specifically, the resistance of the atmosphere or of waste steam to the action of the piston of a steam-engine.


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