- autogiro
[autogiro 词源字典]
- "A form of aircraft with freely rotating horizontal blades and a propeller. It differs from a helicopter in that the blades are not powered but rotate in the slipstream, propulsion being by a conventional mounted engine", 1920s: from Spanish, from auto- 'self' + giro 'gyration'.[autogiro etymology, autogiro origin, 英语词源]