exhaust: v. & n. --v.tr. 1 consume or use up the whole of. 2 (often as exhausted adj. or exhausting adj.) use up the strength or resources of; tire out. 3 study or expound on (a subject) completely. 4 (often foll. by of) empty (a vessel etc.) of its contents. --n. 1 a waste gases etc. expelled from an engine after combustion. b (also exhaust-pipe) the pipe or system by which these are expelled. c the process of expulsion of these gases. 2 a the production of an outward current of air by the creation of a partial vacuum. b an apparatus for this. øøexhauster n. exhaustible adj. exhaustibility n. exhaustibly adv. [L exhaurire exhaust- (as EX-(1), haurire draw (water), drain)]
