The prefix 'aero' is often used in terms related to flying. It is derived from the Greek word for air, and is commonly used to refer to aircraft or aviation-related topics. For example, an aeronautical engineer is someone who designs and builds aircraft, and an aerobatic maneuver is a stunt performed by an aircraft. The prefix is also used in other terms related to flying, such as aerodynamics, which is the study of how air moves around objects, and aeronautics, which is the science of designing and operating aircraft.