Screw-propeller



noun
1.
a rotary propelling device, as for a ship or airplane, consisting of a number of blades that radiate from a central hub and are so inclined to the plane of rotation as to tend to drive a helical path through the substance in which they rotate.
screw propeller
noun
1.
an early form of ship’s propeller in which an Archimedes’ screw is used to produce thrust by accelerating a flow of water

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