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of a large rotor mounted horizontally above the fuselage and turned by air pressure rather than motor power: largely superseded by the helicopter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 of autogiroSp, origin, originally a trademark, Autogiro ; from auto-, auto- + Classical Greek gyros, a circle: see gyrate
nounpl. 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 of autogiroOriginally a trademark.
NounSee also: aŭtogiro