Where does “русокос” come from?

русокос (Bulgarian) comes from Bulgarian рус, from Proto-Slavic rusъ, from Proto-Slavic rudsъ, from Proto-Indo-European h₁rowdʰ-s-o-, from Proto-Indo-European h₁rewdʰ- — red.

русокос (Bulgarian): fair-haired, blond

Definitions

  1. fair-haired, blond

Ancestry of “русокос”, step by step

StepLanguageWordMeaning
1Bulgarianрусblond hair of a light, pale yellow colour
2Proto-Slavicrusъfair, blonde; yellow, red, light-colored
3Proto-Slavicrudsъ
4Proto-Indo-Europeanh₁rowdʰ-s-o-
5Proto-Indo-Europeanh₁rewdʰ-red
Every word from Proto-Indo-European h₁rewdʰ-Every word from Proto-Indo-European h₁rowdʰ-s-o-Every word from Proto-Slavic rudsъ