The crossword solution for the term 'streamlined, in brief' is AERO, which is an acronym for Aerodynamics. Aerodynamics is a branch of physics that studies the motion of air and other gaseous fluids, as well as the forces acting on solid objects in motion relative to such fluids. Streamlining is a technique used to reduce drag on an object moving through a fluid, and is often used in the design of aircraft and automobiles.