Etymology

streamline

S1T1R1E1A1M3L1I1N1E1

Today it means: A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow. Full definition →

English line ← Middle English line ← Old English līne
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The story

  1. Proto-Indo-European*ser-?
  2. Proto-Indo-European*srew-
  3. Proto-Indo-European*srow-mo-s
  4. Proto-Germanic*straumaz
  5. Proto-West Germanic*straum
  6. Old Englishstrēam
  7. Middle Englishstrem
  8. Englishstream
  9. Proto-Indo-European*līno-der.?
  10. Proto-Germanic*līną
  11. Proto-Germanic*līnǭ
  12. Proto-West Germanic*līnā
  13. Old Englishlīne
  14. Middle Englishline
  15. Englishline
  16. English todaystreamline

From stream + line.

Etymology from Wiktionary, CC BY-SA 4.0.