(also autogyro )
■ noun ( plural ~s ) a form of aircraft with unpowered freely rotating horizontal blades and a propeller.
Origin
1920s: from Sp., from auto- 'self' + giro 'gyration'.
AUTOGIRO
Meaning of AUTOGIRO in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004