exhaust /ɪɡˈzɔːst/verb 8noun 5adjective 1forms 3 verb8 •To use up; to deplete, drain or expend wholly, or use until the supply comes to an end.My grandfather seemingly never exhausts his supply of bad jokes.to exhaust one's resources •To tire out; to wear out; to cause to be without any energy.The marathon exhausted me. •To expel (as exhaust).Infections can be reduced further if outside air is exhausted after a single use, rather than re-circulated. — 2013 •To discharge or escape (as exhaust).Steam from both high pressure cylinders exhausts through the respective receiver pipes into cylinders. — 1910 •To discuss thoroughly or completely.That subject has already been exhausted. •To draw or let out wholly; to drain completely.The water was exhausted out of the well.Moisture of the earth is exhausted by evaporation. •To empty by drawing or letting out the contents.It takes approximately 8 to 9 minutes to exhaust the tank of air and fill it with water. — 1922 •To subject to the action of various solvents in order to remove all soluble substances or extractives. noun5 •The steam let out of a cylinder after it has done its work there. •The dirty air let out of a room through a register or pipe provided for the purpose. •Exhaust gas. •A system consisting of the parts of an engine through which burned gases or steam are discharged; see also exhaust system. •An exhaust pipe, especially on a motor vehicle. adjective1 •(no longer used) Exhausted; used up. formsexhausted · exhausting · exhausts