from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A projected mass of fine particles, as of water or snow, having an arced shape similar to that of a rooster's tail.


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  • As applied to aviation: the impressive geyser of water generated behind a jet aircraft flying at high airspeed a few feet above a body of water; it's caused by the aerodynamic flow surrounding the airframe and/or the high pressure jet engine exhaust exiting at the rear of the aircraft. Image here.

    June 15, 2015