(mechanics) A jetjump for lifting water or withdrawing air from a space. {Ejector condenser} (SteamEngine), a condenser in which the vacuum is maintained by a jet pump.
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.
That part of the mechanism of a breech-loading firearm which ejects the empty shell.