Where does “среднемесячный” come from?

среднемесячный (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.

среднемесячный (Russian): average monthly

Definitions

  1. average monthly

Ancestry of “среднемесячный”, step by step

среднемесячный traces back through two 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 сре́дний

StepLanguageWordMeaning
1Russianсре́днийmiddle
2Old Church Slavonicсрѣдьнъ—
3Proto-Slavicserdьnъmiddle, central
4Proto-Slavicserdamiddle; Wednesday
5Proto-Balto-Slavicśerd-—
6Proto-Indo-Europeanḱerd-heart
Every word from Proto-Indo-European meh₁- →Every word from Proto-Indo-European mḗh₁n̥s →Every word from Proto-Slavic měsęcь →