- noun a device to throw something out forcefully
- noun a device using a jet of water, air, or steam to withdraw a fluid or gas from a space
- A pump for ejecting liquid.
- In plumbing, a device used to pump sewage from a lower to a higher elevation.
- In excavation, a dirt-pushing mechanism in a scraper bowl.
- noun something which ejects (such as the part of a firearm which ejects the empty cases)