noun, plural autogiros.
an aircraft with an unpowered, horizontally rotating propeller on a shaft above the fuselage that provides lift for the machine, with forward propulsion being provided by a conventional propeller: superseded in most applications by the helicopter.
Also, autogyro.
Also called gyrocopter, gyroplane.

1920–25; formerly a trademark Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
autogiro or autogyro (ˌɔːtəʊˈdʒaɪrəʊ)
n , pl -ros
Compare helicopter Also called: gyroplane a self-propelled aircraft supported in flight mainly by unpowered rotating horizontal blades
[C20: originally a trademark]
autogyro or autogyro
[C20: originally a trademark]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica


rotary-wing aircraft, superseded after World War II by the more efficient helicopter. It employed a propeller for forward motion and a freely rotating, unmotorized rotor for lift. In searching for an aircraft that could be slowed down in flight and landed vertically, experimenters built many prototypes that were difficult to control in flight

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The design recalls the precursor of the helicopter, the autogiro.
She is giving demonstration flights of her autogiro, a plane with rotating blades on top as well as a propeller.
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