One who or that which streamlines something. / Something with a streamlined design, especially railroad locomotives and passenger equipment.

plural of streamliner

(physics) A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow.

(transitive) To design and construct the contours of a vehicle etc. so as to offer the least resistance to its flow through a fluid.

plural of streamline

simple past tense and past participle of streamline

Designed to offer little resistance to the flow of fluid, especially by having sleek, graceful lines. / Having been made more simple and straight forward.

The process by which something is streamlined.

present participle of streamline

plural of streamlining