Etymology

respirometer

R1E1S1P3I1R1O1M3E1T1E1R1

Today it means: A device used to measure the rate of respiration of living organisms, such as plants or fish. Full definition →

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

  1. Englishrespire
  2. Proto-Indo-European*med-
  3. Proto-Indo-European*meh₁-
  4. Ancient Greekμέτρον (métron)
  5. English todayrespirometer

From respire + -o- + -meter.

Etymology from Wiktionary, CC BY-SA 4.0.