The word exhaust can mean:-
- A verb meaning "tire out", as in "After the long gallop, his horse was exhausted."
- A verb meaning "use up, consume", as in "That area's copper ore deposits are nearly exhausted".
- A noun meaning "waste gases produced by an internal combustion engine" (see exhaust gas), or "the pipework that those waste gases are discharged through".
- A noun meaning "waste low-pressure steam emitted by a steam engine".
- Sometimes, the pipe in a breathing apparatus that its user breathes out through.
- The backblast produced by a jet engine or a rocket.
The word comes from the Latin exhaustus meaning "drained dry, emptied", from the verb exhauriō.
