Where does “mérő” come from?

mérő (Hungarian) comes from Hungarian mér, from Hungarian -s — Added to a noun to form an adjective meaning...

mérő (Hungarian): present participle of mér; measuring; meter

Definitions

Step	Language	Word	Meaning
1	Hungarian	mér	to measure, gauge, weigh, clock, time; to strike...
2	Hungarian	-s	Added to a noun to form an adjective meaning...

mérő — Etymology, Origin & Word History | Etymology Explorer