Etymology

rheoplethysmograph

Today it means: An instrument for the measurement of variation in volume of organs by measurement of variations in electric impedance Full definition →

English plethysmograph ← Ancient Greek ῥέω (rhéō) ← Proto-Hellenic *hréwō
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The story

  1. Proto-Indo-European*ser-?
  2. Proto-Indo-European*srew-
  3. Proto-Indo-European*sréweti
  4. Proto-Hellenic*hréwō
  5. Ancient Greekῥέω (rhéō)
  6. Englishrheo-
  7. Englishplethysmograph
  8. English todayrheoplethysmograph

From rheo- + plethysmograph.

Etymology from Wiktionary, CC BY-SA 4.0.