Etymology

plethysmograph

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Today it means: An instrument for measuring changes in volume within an organ or whole body (usually via fluctuations in the amount of fluid it contains). Full definition →

Ancient Greek πληθυσμός
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The story

  1. Ancient Greek · borrowed fromπληθυσμός“enlargement”
  2. English todayplethysmograph

Late 19th century: from Ancient Greek πληθυσμός (plēthusmós, “enlargement”) + -graph.

Words from the same roots

Ancient Greekπληθυσμός all →

plethysmometer

Etymology from Wiktionary, CC BY-SA 4.0.