Etymology

tachy-

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Ancient Greek τᾰχῠ́ς (tăkhŭ́s) ← Proto-Indo-European *dʰn̥gʰ-ú-sder.?
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The story

  1. Proto-Indo-European*dʰengʰ-
  2. Proto-Indo-European*dʰn̥gʰ-ú-sder.?
  3. Ancient Greekτᾰχῠ́ς (tăkhŭ́s)
  4. English todaytachy-

Borrowed from Ancient Greek τᾰχῠ́ς (tăkhŭ́s, “swift”).

Etymology from Wiktionary, CC BY-SA 4.0.