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From: Webster's Revised Unabridged Dictionary (1913)

 Tractor screw or  Tractor propeller. Aviation A propeller screw placed in front of the supporting planes of an airplane instead of behind them, so that it exerts a pull instead of a push. Hence, Tractor monoplane, Tractor biplane, etc.  This is the most common arrangement for propellers on modern airplanes.
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