PROPELLER

Pro‐pel″ler (?), n. 1. 1. One who, or that which, propels.
2. 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. 3. A steamboat thus propelled; a screw steamer.
Propeller wheel,the screw, usually having two or more blades, used in propelling a vessel.