Ejector n. : One who, or that which, ejects or dispossesses.

Ejector n. : A jet jump for lifting water or withdrawing air from a space.

Example:
What does and Ejector pit do, and why does mine make a loud noise?

Taxonomy
ejector, fluid, pressure, steam ejector, steam, stages, suction pressure, condenser, motive, capacity, Ejector Pumps, discharge pressure, croll, multi-stage, design, non-condensing, enthalpy, steam condenser.

Defination from the web:
ejector. ... The higher the molecular weight of a fluid, the greater the ejector suction capacity, assuming equal motivating quantities. Conversely, an ejector will handle less of lower molecular weight fluids. ...