Etymology

teinoscope

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Today it means: An instrument formed by combining prisms so as to correct the chromatic aberration of the light while linear dimensions of objects seen through the prisms are increased or diminished Full definition →

Ancient Greek τείνω
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The story

  1. Ancient Greek · derived fromτείνω“I extend”
  2. English todayteinoscope

Ancient Greek τείνω (teínō, “I extend”) + + -scope.

Etymology from Wiktionary, CC BY-SA 4.0.