aerobrake Syllabification: (aer·o·brake)Pronunciation: /ˈe(ə)rōˌbrāk/Definition of aerobrake verb [no object] technical cause a spacecraft to slow down by flying through a planet’s rarefied atmosphere to produce aerodynamic drag. noun a mechanism for aerobraking. aerobrake in other Oxford dictionaries Definition of aerobrake in the British & World English dictionary