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Definition of PROPELLER
: one that propels; especially: a device that consists of a central hub with radiating blades placed and twisted so that each forms part of a helical surface and that is used to propel a vehicle (as a ship or airplane)
Device with a central hub and radiating blades placed so that each forms part of a helical (spiral) surface, used to propel a vehicle such as a ship or airplane. By its rotation in water or air, the propeller produces thrust on the blades, which gives forward motion to the vehicle.