Etymology

orthocentre

O1R1T1H4O1C3E1N1T1R1E1
English centre ← Ancient Greek ὀρθός (orthós) ← Proto-Hellenic *ortʰwós
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The story

  1. Proto-Indo-European*h₃er-
  2. Proto-Indo-European*dʰeh₁-
  3. Proto-Indo-European*h₃érdʰeti?
  4. Proto-Indo-European*h₃erdʰ-
  5. Proto-Hellenic*ortʰwós
  6. Ancient Greekὀρθός (orthós)
  7. Englishortho-
  8. Englishcentre
  9. English todayorthocentre

From ortho- + centre.

Etymology from Wiktionary, CC BY-SA 4.0.