Impeller (noun)

A rotating component in a pump or fan that moves fluid or air by imparting motion to it.

Origin:

From old french empelle, from empaller, to stamp, from latin impalare, to drive a stake into, from in- + palus, stake.

Examples:

1. The impeller in the water pump was worn and needed to be replaced.
2. The impeller in the centrifugal fan was spinning at high speed, producing a flow of air.
3. The impeller in the pump was designed with curved vanes to maximize its efficiency.
4. The impeller in the blower was driven by a motor, which provided the necessary power.
5. The impeller in the cooling system was a critical component, as it regulated the flow of fluid through the engine.