The crossword solution for the term 'prefix before 'DYNAMIC'' is AERO, which is a four-letter word. AERO is a prefix that means 'AIR' or 'ATMOSPHERE, ' and it is often used in combination with other words to describe something related to AIR or ATMOSPHERE. For example, the word 'AERODYNAMIC' combines the prefix AERO with the word 'DYNAMIC, ' meaning 'having to do with motion.' Therefore, the prefix AERO before the word 'DYNAMIC' creates the word 'AERODYNAMIC, ' which describes something that is related to AIR or ATMOSPHERE and motion.