The crossword solution for the term 'streamlined, for short' is AERO, which is a four-letter word. AERO stands for aerodynamic, which is a term used to describe objects that have been designed to reduce drag and increase efficiency when moving through air or water. Streamlining is a design technique used to reduce drag and improve the efficiency of an object, such as an aircraft or boat. Streamlining can also be used to improve the performance of other objects, such as cars and bicycles.