Etymology

goniometer

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Today it means: A device used to measure the angles of joints commonly used in orthopedics and physical therapy. Full definition →

Ancient Greek μέτρον (métron) ← Proto-Indo-European *meh₁- ← English gonio-
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The story

  1. Proto-Indo-European*ǵónu
  2. Proto-Hellenic*gónu
  3. Proto-Hellenic*gonwía
  4. Ancient Greekγωνίᾱ (gōníā)
  5. Englishgonio-
  6. Proto-Indo-European*med-
  7. Proto-Indo-European*meh₁-
  8. Ancient Greekμέτρον (métron)
  9. English todaygoniometer

From gonio- + -meter.

Etymology from Wiktionary, CC BY-SA 4.0.