Where does “hydroplethysmometer” come from?

hydroplethysmometer (English) comes from English plethysmometer, from English -meter, from French mètre, from Latin metrum, from Ancient Greek μέτρον, from Ancient Greek -τρον, from Proto-Hellenic -tron, from Proto-Indo-European -trom — Derives agent nouns from verbs, denoting someone...

hydroplethysmometer (English): A plethysmometer that employs water

Definitions

  1. A plethysmometer that employs water

Ancestry of “hydroplethysmometer”, step by step

hydroplethysmometer traces back through two separate lines of ancestry.

via English plethysmometer

StepLanguageWordMeaning
1EnglishplethysmometerAny instrument designed to measure small changes in volume, usually via the displacement of water
2English-meterUsed to form the names of measuring devices
3Frenchmètremetre/meter; first-person singular present...
4Latinmetruma measure
5Ancient Greekμέτρονsomething used to measure: measure, rule, weight;...
6Ancient Greek-τρονForms instrument nouns
7Proto-Hellenic-tronForms instrument nouns from verb stems
8Proto-Indo-European-tromForms nouns denoting a tool or instrument
9Proto-Indo-European-tḗrDerives agent nouns from verbs, denoting someone...

via English hydro

StepLanguageWordMeaning
1Englishhydrohydroelectric; hydroponic; hydroelectric power
2Ancient Greekὕδωρwater; rainwater, rain; sweat
3Proto-Hellenic*údōrwater
Every word from Proto-Indo-European -tḗrEvery word from Ancient Greek -τρονEvery word from Ancient Greek μέτρον