- System consisting of the parts of an engine through which burned gases or steam are discharged
- The steam let out of a cylinder after it has done its work there.
- The foul air let out of a room through a register or pipe provided for the purpose.
- An exhaust pipe, especially on a motor vehicle.
- 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.
- To empty by drawing or letting out the contents; as, to exhaust a well, or a treasury.
- 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.
Etymology: From exhaustus (past participle of exhaurire).
- A decrepit, exhausted old man at fifty-five. --Motley.
- To bring out or develop completely; to discuss thoroughly; as, to exhaust a subject.
- (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.
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Full Definition of exhaust