Where does “месячные” come from?

месячные (Russian) comes from Russian ме́сячный, from Russian ме́сяц, from Old East Slavic мѣсѧць, from Proto-Slavic měsęcь, from Proto-Indo-European mḗh₁n̥s, from Proto-Indo-European meh₁- — to measure.

месячные (Russian): menstruation

Definitions

  1. menstruation

Ancestry of “месячные”, step by step

месячные traces back through 3 separate lines of ancestry.

via Russian ме́сячный

StepLanguageWordMeaning
1Russianме́сячныйmonthly
2Russianме́сяцmonth
3Old East Slavicмѣсѧцьmoon
4Proto-Slavicměsęcьmoon; month
5Proto-Indo-Europeanmḗh₁n̥smoon; month
6Proto-Indo-Europeanmeh₁-to measure

via Russian ме́сячные очище́ния

StepLanguageWordMeaning
1Russianме́сячные очище́нияmonthly cleanings

via Russian ме́сячные кро́ви

StepLanguageWordMeaning
1Russianме́сячные кро́ви
Every word from Proto-Indo-European meh₁-Every word from Proto-Indo-European mḗh₁n̥sEvery word from Proto-Slavic měsęcь