ejector

noun5

1. •
   One who, or that which, ejects or dispossesses.
2. •
   ejector seat: a pilot's seat in an airplane that can be forcibly ejected in the case of an emergency; then the pilot descends by parachute.
3. •
   That part of the mechanism of a breech-loading firearm which ejects the empty shell.
4. •
   A lever for removing circuit boards from an electronic chassis.
5. •
   A jet jump for lifting water or withdrawing air from a space.