ejector

e·jec·tor  (-jktr)

n.

1. One that ejects, especially a device in a gun that ejects the empty shell after each firing.

2. A device using a jet of water, air, or steam to withdraw a fluid or gas from a space.

Thesaurus

Noun	1.	ejector - a person who ousts or supplants someone else ouster individual, mortal, person, somebody, someone, soul - a human being; "there was too much for one person to do"
	2.	ejector - a mechanism in a firearm that ejects the empty shell case after firing cartridge ejector gun - a weapon that discharges a missile at high velocity (especially from a metal tube or barrel) mechanism - device consisting of a piece of machinery; has moving parts that perform some function