pro·pel·ler /prəˈpɛlɚ/
  螺旋槳,推進器
  Pro·pel·ler 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.
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  propeller
       n : a mechanical device that rotates to push against air or
           water [syn: propellor]