streamline

Short definition from Wiktionary

Noun

1. 1
   A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow.
2. 2
   On a weather chart, a line that is tangent to the flow of the wind.

Verb

1. 1
   To design and construct the contours of a vehicle etc. so as to offer the least resistance to its flow through a fluid.
2. 2
   To simplify or organize a process in order to increase its efficiency.
3. 3
   To modernize.