Streamline

virtaviiva

(line that is tangent to the velocity of flow of a fluid)

virtaviiva

(meteorology: line that is tangent to the velocity of flow of the wind)

keventää

(to simplify a process)

nykyaikaistaa

(to modernise)

sujuvoittaa

(to simplify a process)

tehostaa

(to simplify a process)

virtaviivaistaa

(to design an object so as to offer least resistance to its flow through a fluid)