plethysmograph

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US/plɛˈðɪz.məˌɡɹæf/US/pləˈðɪz.məˌɡɹæf/

noun

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

OriginAncient Greek πληθυσμός →
Scrabble 30
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Meanings

nounplethysmograph (plural plethysmographs)

plural plethysmographs

  1. medicineAn instrument for measuring changes in volume within an organ or whole body (usually via fluctuations in the amount of fluid it contains).

Origin

  1. Ancient Greekπληθυσμός“enlargement”
  2. Englishplethysmograph

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

More words from Ancient Greek

Full word history & related roots →
Cite this entry
APA

plethysmograph. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/plethysmograph

MLA

“plethysmograph.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/plethysmograph. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “plethysmograph,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/plethysmograph.

Source: plethysmograph on Wiktionary, CC BY-SA 4.0.