Where does “ржавчинный гриб” come from?

ржавчинный гриб (Russian) comes from Russian ржа́вчинный, from Russian -ый, from Church Slavonic -ыи, from Proto-Slavic jь, from Proto-Balto-Slavic iś, from Old Polish ić, from Proto-Slavic jьti, from Proto-Balto-Slavic eitei — to go.

ржавчинный гриб (Russian): rust fungus

Definitions

  1. rust fungus

Ancestry of “ржавчинный гриб”, step by step

ржавчинный гриб traces back through two separate lines of ancestry.

via Russian ржа́вчинный

StepLanguageWordMeaning
1Russianржа́вчинныйrust, related to rust
2Russian-ыйMasculine nominative singular adjective ending;...
3Church Slavonic-ыи
4Proto-Slavicthis; he
5Proto-Balto-Slavicthis
6Old Polishto go
7Proto-Slavicjьtito go
8Proto-Balto-Slaviceiteito go
9Proto-Indo-Europeanh₁éytito go, to be going
10Proto-Indo-Europeanh₁ey-to go

via Russian гриб

StepLanguageWordMeaning
1Russianгрибfungus (a category of eukaryotic organism, having cell walls but no chlorophyll)
2Proto-Slavicgribъmushroom
3Proto-Slavicgribatito scrape, to dig
Every word from Proto-Indo-European h₁ey-Every word from Proto-Indo-European h₁éytiEvery word from Proto-Balto-Slavic eitei