A mechanical device with evenly-shaped blades that turn on a shaft to push against air or water, especially one used to propel an aircraft or boat.
One who, or that which, propels.
A steamboat thus propelled; a screw steamer.
A spinnerbait.
a wind-driven generator, working on the same principle as a wind turbine but usually on a smaller scale, used for example for charging batteries on sailing boats.