autogiro definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
noun pl. autogiros
an aircraft that moves forward by means of a propeller and is supported in the air mainly by means of a large rotor mounted horizontally above the fuselage and turned by air pressure rather than motor power: largely superseded by the helicopter
Origin: Spanish origin, originally a trademark, Autogiro ; from auto-, auto- plush Classical Greek gyros, a circle: see gyrate
autogiro definition by American Heritage Dictionary
also au·to·gy·ronoun pl. au·to·gi·ros also au·to·gy·ros
An aircraft powered by a conventional propeller and supported in flight by a freewheeling, horizontal rotor that provides lift.
Origin: Originally a trademark.