Exhaust (?), v. t. [imp. & p. p. Exhausted; p. pr. & vb. n. Exhausting.] [L. exhaustus, p. p. of exhaurire; ex out + haurire, haustum, to draw, esp. water; perhaps akin to Icel. asua to sprinkle, pump.] 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.
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2. To empty by drawing or letting out the contents; as, to exhaust a well, or a treasury.
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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.
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A decrepit, exhausted old man at fifty-five. Motley.
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4. To bring out or develop completely; to discuss thoroughly; as, to exhaust a subject.
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5. (Chem.) 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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Exhausted receiver. (Physics) See under Receiver.

Syn. -- To spend; consume; tire out; weary.
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Exhaust, n. (Steam Engine) 1. The steam let out of a cylinder after it has done its work there.
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2. The foul air let out of a room through a register or pipe provided for the purpose.
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