The term 'prefix with ballistic' can be solved by the word 'aero', which is a four-letter prefix meaning 'AIR'. It is derived from the Greek word 'aer', which means 'AIR'. This prefix is often used in combination with other words to describe something related to AIR or the atmosphere, such as aerodynamics, aeronautics, and aerobatics. In this case, the term 'ballistic' refers to the science of projectiles, so the combination of 'aero' and 'ballistic' would refer to something related to the study of projectiles in the AIR.