noun
exhaust
Waste gases discharged by an engine.
The idling truck fills the garage with dangerous exhaust.
Etymology
The Latin verb means to draw out or empty. An engine exhausts its spent gases, and the noun names the waste material drawn or expelled from it.
More examples
- Diesel exhaust drifts through the bus station.
- The exhaust pipe carries hot gases away from the engine.
- This filter removes harmful particles from engine exhaust.