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.-to bring out or develop completely; to discuss thoroughly; as, to exhaust a subject.-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.-drained; exhausted; having expended or lost its energy.-pertaining to steam, air, gas, etc., that is released from the cylinder of an engine after having preformed its work.-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.