<p><strong>Noun:</strong></p><ul><li>a device having a revolving hub with radiating blades, for propelling an airplane, ship, etc.</li><li>a person or thing that propels.</li><li>the bladed rotor of a pump that drives the fluid axially.</li><li>a wind-driven, usually three-bladed, device that provides mechanical energy, as for driving an electric alternator in wind plants.</li></ul>