Where does “единородный” come from?

единородный (Russian) comes from Russian род, from Old East Slavic родъ, from Proto-Slavic rǫdъ, from Proto-Balto-Slavic radás, from Proto-Indo-European wréh₂ds — root.

единородный (Russian): the only (begotten) (of the only child in a family)

Definitions

  1. the only (begotten) (of the only child in a family)

Ancestry of “единородный”, step by step

единородный traces back through two separate lines of ancestry.

via Russian род

StepLanguageWordMeaning
1Russianродgeneration, birth, origin, stock, family, race;...
2Old East Slavicродъ—
3Proto-Slavicrǫdъthorny, prickly; curly, locky
4Proto-Balto-Slavicradásbirth, genus
5Proto-Indo-Europeanwréh₂dsroot

via Russian еди́ный

StepLanguageWordMeaning
1Russianеди́ныйunited, unified, common, indivisible
2Church Slavonicѥдинъ—
Every word from Proto-Indo-European wréh₂ds →Every word from Proto-Balto-Slavic radás →Every word from Proto-Slavic rǫdъ →