
A turbopump is a propellant pump with two main components: a rotodynamic pump and a driving gas turbine, usually both mounted on the same shaft, or sometimes geared together. The purpose of a turbopump is to produce a high pressure fluid for feeding a combustion chamber or other use. A turbopump can comprise one of two types of pumps: centrifugal ...
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http://en.wikipedia.org/wiki/Turbopump

A pump driven by a gas turbine, generally used to pump propellant into a combustion chamber.
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http://www.braeunig.us/space/glossary.htm

A component of some high-thrust liquid-propellant rocket engines. The turbopump increases the flow of propellant to the combustion chamber to increase performance.
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http://www.daviddarling.info/encyclopedia/T/turbopump.html

a turbine-driven pump, as one used to feed propellant to a rocket engine.
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https://www.infoplease.com/dictionary/turbopump
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