Where does “lensmeter” come from?

lensmeter (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...

lensmeter (English): An optician's instrument for verifying spectacle...

Definitions

  1. An optician's instrument for verifying spectacle...

Ancestry of “lensmeter”, step by step

lensmeter 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 lens

StepLanguageWordMeaning
1EnglishlensAn object, usually made of glass, that focuses or...
2Latinlēnslentil
Every word from Proto-Indo-European -tḗr