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  1. System consisting of the parts of an engine through which burned gases or steam are discharged
  2. The steam let out of a cylinder after it has done its work there.
  3. The foul air let out of a room through a register or pipe provided for the purpose.
  4. An exhaust pipe, especially on a motor vehicle.
  • Dutch: uitlaatpijp (1), uitlaat (1,2,3)
  • German: Auspuff (1,4)
  • Spanish: tubo de escape (1)
  1. To draw or let out wholly; to drain off completely; as, to exhaust the water of a well; the moisture of the earth is exhausted by evaporation.
  2. To empty by drawing or letting out the contents; as, to exhaust a well, or a treasury.
  3. To drain, metaphorically; to use or expend wholly, or till the supply comes to an end; to deprive wholly of strength; to use up; to weary or tire out; to wear out; as, to exhaust one's strength, patience, or resources.
A decrepit, exhausted old man at fifty-five. --Motley.
  1. To bring out or develop completely; to discuss thoroughly; as, to exhaust a subject.
  2. (chemistry) To subject to the action of various solvents in order to remove all soluble substances or extractives; as, to exhaust a drug successively with water, alcohol, and ether.
    Etymology: From exhaustus (past participle of exhaurire).

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