Where does “ruber” come from?

ruber (Latin) comes from Proto-Italic ruðros, from Proto-Indo-European h₁rudʰrós, from Proto-Indo-European h₁rewdʰ- — red.

ruber (Latin): red ; ruddy

Definitions

Step	Language	Word	Meaning
1	Proto-Italic	ruðros	red
2	Proto-Indo-European	h₁rudʰrós	red
3	Proto-Indo-European	h₁rewdʰ-	red

ruber — Etymology, Origin & Word History | Etymology Explorer