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. ]

v. t. 1. to design or modify so as to present the least possible resistance to fluid flow; -- used mostly of vehicles, such as automobiles, airplanes, or ships. [ PJC ]

2. [ Fig. ] to change so as to make more efficient; -- used especially of organizations, procedures, or methods. “The streamlined company became a formidable competitor.” [ PJC ]