What does "streamline" mean?

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

What is a synonym for "streamline"?

Common synonyms include: air line, airline, axis, beeline, boil down, chord.

//ˈstriːmlaɪn// noun, verb

noun, verb ·Uncommon ·College level

Noun

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
On a weather chart, a line that is tangent to the flow of the wind.

Verb

1
To design and construct the contours of a vehicle etc. so as to offer the least resistance to its flow through a fluid. transitive
"The J's originally were streamlined after the style of the New Haven's 1400- class 4-6-4's and were considered by many to be a handsome locomotive. A program to gradually destreamline the class began in April 1947."
2
contour economically or efficiently wordnet
3
To simplify or organize a process in order to increase its efficiency. broadly, transitive
"The subcommittee concludes FDA should become less involved in the early stages of clinical research by streamlining and uncumbering its regulations governing them."
4
To modernize. transitive