Webster’s Revised Unabridged Dictionary · 1913
Propeller
Pro·pel′ler, n.
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.