Etymology

stereopticon

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Today it means: A magic lantern, especially one with two projectors arranged so as to produce dissolving views or combinations of images. Full definition →

Ancient Greek ὀπτικός (optikós) ← Proto-Indo-European *h₃ekʷ- ← English stereo-
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The story

  1. Proto-Indo-European*ster-
  2. Ancient Greekστερεός (stereós)
  3. Ancient Greekστερεο- (stereo-)
  4. Englishstereo-
  5. Proto-Indo-European*h₃ekʷ-
  6. Ancient Greekὄψ (óps)
  7. Ancient Greekὄψις (ópsis)
  8. Ancient Greekὀπτικός (optikós)
  9. English todaystereopticon

From stereo- (“three-dimensional”) + Ancient Greek ὀπτικός (optikós, “visual”).

Etymology from Wiktionary, CC BY-SA 4.0.