Etymology

ortho-

or·tho-

Today it means: Right angle, perpendicular. Full definition →

Ancient Greek ὀρθός (orthós) ← Proto-Hellenic *ortʰwós ← Proto-Indo-European *h₃erdʰ-
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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. English todayortho-

Learned borrowing from Ancient Greek ὀρθός (orthós).

Words from the same roots

Ancient Greekὀρθός all →

orthoepyOrthogonianorthomorphicorthopediaorthotonos

Etymology from Wiktionary, CC BY-SA 4.0.