streamline
1. stream.line \'stre-m-.li-n\ n 1: the path of a fluid particle relative to a solid body past which the flu id is moving in smooth flow without turbulence 2a: a contour designed to minimize resistance to motion through a fluid (as air) 2b: a fluid or smooth line designed as if for decreasing air resistance 2. streamline vt 1: to design or construct with a streamline 2: to bring up to date : MODERNIZE 3a: ORGANIZE 3b: to make simpler or more efficient