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au·to·gi·ro | \ ˌȯ-tō-ˈjī-(ˌ)rō 
\
\variants:
or autogyro
plural autogiros
Definition of autogiro
: a rotary-wing aircraft that employs a propeller for forward motion and a freely rotating rotor for lift
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Time Traveler for autogiro
The first known use of autogiro was in 1907
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