Where does “rubian” come from?

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

rubian (English): One of several colour-producing glycosides found...

Definitions

One of several colour-producing glycosides found...

Ancestry of “rubian”, step by step

Step	Language	Word	Meaning
1	Latin	rubia	A red dye, madder
2	Latin	ruber	red ; ruddy
3	Proto-Italic	ruðros	red
4	Proto-Indo-European	h₁rudʰrós	red
5	Proto-Indo-European	h₁rewdʰ-	red

Every word from Proto-Indo-European h₁rewdʰ- →

rubian — Etymology, Origin & Word History | Etymology Explorer