GNU Collaborative International Dictionary of English

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1.       
   Streamline (?), a. Of or pert. to a stream line; designating a motion or flow that is free from turbulence, like that of a particle in a streamline; hence, designating a surface, body, etc., that is designed so as to afford an unbroken flow of a fluid about it, esp. when the resistance to flow is the least possible; as, “a streamline body for an automobile or airship”; -- the current usuage prefers the term streamlined.
   
   [Webster 1913 Suppl.]