{ Tractor screworpropeller }. (Aviation) A propeller screw placed in front of the supporting planes of an aëroplane instead of behind them, so that it exerts a pull instead of a push. Hence, Tractor monoplane, Tractor biplane, etc.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.