Etymology

plethysmometer

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Today it means: Any instrument designed to measure small changes in volume, usually via the displacement of water Full definition →

Ancient Greek πληθυσμός
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The story

  1. Ancient Greek · borrowed fromπληθυσμός“increase”
  2. English todayplethysmometer

From Ancient Greek πληθυσμός (plēthusmós, “increase”) + -meter.

Words from the same roots

Ancient Greekπληθυσμός all →

plethysmograph

Etymology from Wiktionary, CC BY-SA 4.0.