Where does “swaymeter” come from?

swaymeter (English) comes 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, from Proto-Indo-European -tḗr — Derives agent nouns from verbs, denoting someone...

swaymeter (English): A device that measures postural sway (in people standing still)

Definitions

  1. A device that measures postural sway (in people standing still)

Ancestry of “swaymeter”, step by step

swaymeter traces back through two separate lines of ancestry.

via English meter

StepLanguageWordMeaning
1EnglishmeterA device that measures things; A parking meter or...
2Frenchmètremetre/meter; first-person singular present...
3Latinmetruma measure
4Ancient Greekμέτρονsomething used to measure: measure, rule, weight;...
5Ancient Greek-τρονForms instrument nouns
6Proto-Hellenic-tronForms instrument nouns from verb stems
7Proto-Indo-European-tromForms nouns denoting a tool or instrument
8Proto-Indo-European-tḗrDerives agent nouns from verbs, denoting someone...

via English sway

StepLanguageWordMeaning
1EnglishswayThe act of swaying; a swaying motion; a swing or...
2EnglishswearTo take an oath, to promise; To use offensive,...
3Middle EnglishswareAlternative form of square; A response to a query...
4Old Englishswaruan oath, vow
5Proto-Germanicswarōa solemn statement or affirmation; oath; vow
6Proto-Indo-Europeanswer-to ache; to fester; wound; injury
Every word from Proto-Indo-European -tḗrEvery word from Ancient Greek -τρονEvery word from Ancient Greek μέτρον