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n. One that impels, as a rotating device used to force a fluid in a desired direction under pressure.

n. A rotor or rotor blade.

n. Something which or someone who impels, usually a part of a pump.

n. One who, or that which, impels.

n. One who or that which impels.

n. Specifically, the revolving wheel or pumping element of a centrifugal fan or pump.

n. the blade of a rotor (as in the compressor of a jet engine)

"In these pumps, the impeller is a wheel with blades radiating from the centre to the periphery which, when rotated at high speed, impart movement to the water and produce an outward flow due to centrifugal forces; the angle between the direction of entry and exit of water flow is 90 degrees."

vane    blade   

impel   

stator    supercharger    separators    weathercock    contactor