A propeller is a device with blades which is attached to a boat or aircraft. The engine makes the propeller spin round and causes the boat or aircraft to move. a fixed three-bladed propeller. 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
A contrivance for propelling a steam vessel, usually consisting of a screw placed in the stern under water, and made to revolve by an engine; a propeller wheel
the device with two or (usually) three blades connected to a shaft and turned by the engine, thereby generating thrust from rotation in the water; current unlimited hydroplanes employ a surface-piercing propeller; also called "prop," wheel," or "screw "