impeller

[im-pel-er]
noun
1.
a person or thing that impels.
2.
a rotor for transmitting motion, as in a centrifugal pump, blower, turbine, or fluid coupling.

Origin:
1675–85; impel + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impeller (ɪmˈpɛlə)
 
n
1.  the vaned rotating disc of a centrifugal pump, compressor, etc
2.  a compressor or centrifugal pump having such an impeller

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The impeller increases the kinetic energy of the fluid by accelerating it from
  the impeller center out to the tip.
The impeller tip speed largely determines the pressure generated by a pump.
The impeller itself has a relatively simple two dimensional design.
The approach is to sense the onset of surge with a probe that directly measures
  re-circulation at the impeller inlet.
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