Where does “rumenjak” come from?

rumenjak (Slovene) comes from Slovene rumèn, from Proto-Slavic ruměnъ, from Proto-Slavic rudměnъ, from Proto-Indo-European h₁rewdʰ- — red.

rumenjak (Slovene): yolk

Definitions

Step	Language	Word	Meaning
1	Slovene	rumèn	—
2	Proto-Slavic	ruměnъ	ruddy, rosy, pink
3	Proto-Slavic	rudměnъ	—
4	Proto-Indo-European	h₁rewdʰ-	red

rumenjak — Etymology, Origin & Word History | Etymology Explorer