v 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.
v To empty by drawing or letting out the contents; as, to exhaust a well, or a treasury.
v 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.
v To bring out or develop completely; to discuss thoroughly; as, to exhaust a subject.
v (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.
n A system consisting of the parts of an engine through which burned gases or steam are discharged; see also exhaust system.
n The steam let out of a cylinder after it has done its work there.
n The foul air let out of a room through a register or pipe provided for the purpose.