What is an impeller?

What is an impeller? Here are some definitions.

Noun
  1. Something which or someone who impels, usually a part of a pump.
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Rotation of the impeller draws liquid through the inlet cap opening and pushes the liquid through the pump flow path.
The flow of air exits the impeller and enters a vaneless diffuser, where it is straightened out and sent into the scroll.
In the vaned impeller, the fluid undergoes an abrupt acceleration and change of direction as it enters the rotor.
Centrifugal pumps are not positive-displacement pumps because the impeller can slip in the liquid.
The impeller on the water pump was just about gone and the bushing holding it to the shaft was cracked.
It whips it up to speed dramatically, but the impeller doesn't compress the air or generate boost.

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