autorotation
/ˌɔːtəʊrəʊˈteɪʃən/noun
mass noun
1- rotation of an object caused by the flow of moving air or water around the shape of the object (e.g. a winged seed)自转。
1.1
- such rotation in the rotor blades of a helicopter that is descending without engine power（下降的直升机旋翼不借助引擎动力的）自转。
派生词