Webster's English Dictionary

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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