im·pel·ler

[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

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
impeller (ɪmˈpɛlə) [Click for IPA pronunciation guide]
 
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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00:10
Impeller is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a gadget; dingus; thingumbob.
Example sentences
The approach is to sense the onset of surge with a probe that directly measures
  re-circulation at the impeller inlet.
The impeller increases the kinetic energy of the fluid by accelerating it from
  the impeller center out to the tip.
The impeller itself has a relatively simple two dimensional design.
The fundamental principal is to rotate an impeller at a sufficient rpm as to
  cause a vacuum behind the impeller.
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