1. One who, or that which, propels.
2. 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.
3. A steamboat thus propelled; a screw steamer.
Propeller wheel,the screw, usually having two or more blades, used in propelling a vessel.
n : a mechanical device that rotates to push against air or
water [syn: propellor]