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 device that circulates fresh air and expels stale or noxious air.
A machine that moves breathable air into and out of the lungs of a patient who is unable to breathe sufficiently.
Some behaviour or happening that relieves a tense atmosphere or situation.