From The Collaborative International Dictionary of English v.0.48:
Streamline \Stream"line`\, 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.]
From The Collaborative International Dictionary of English v.0.48:
streamline \stream"line\, 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]