A propeller is a rounded blade that rotates in a circle, helping to move a vehicle by pushing against water or air. A speed boat's propeller moves it forward by spinning against the water.

Propellers use the laws of physics to propel, or drive forward, an aircraft or a boat. The basic structure of a propeller is a spinning or rotating shaft with wide, curved blades attached to it. The very simplest propellers were first used in ancient Greece, where the inventor Archimedes invented a "screw propeller" that moved water for irrigating crops.

Definitions of propeller
  1. noun
    a mechanical device that rotates to push against air or water
    synonyms: propellor
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    airplane propeller, airscrew, prop
    a propeller that rotates to push against air
    screw, screw propeller
    a propeller with several angled blades that rotates to push against water or air
    variable-pitch propeller
    propeller for which the angle of the blades is adjustable
    type of:
    mechanical device
    mechanism consisting of a device that works on mechanical principles
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