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(), 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. Tractor screw or propeller}. (Aviation) A propeller screw placed in front of the supporting planes of an aroplane instead of behind them, so that it exerts a pull instead of a push. Hence, Tractor monoplane, Tractor biplane, etc. スポンサード リンク
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