Where does “robiginandus” come from?

robiginandus (Latin) comes from Latin robigino, from Latin rōbīgō, from Latin rōbus, from Proto-Italic rouβos, from Proto-Indo-European h₁rewdʰ- — red.

Definitions

Ancestry of “robiginandus”, step by step

Step	Language	Word	Meaning
1	Latin	robigino	I rust
2	Latin	rōbīgō	rust
3	Latin	rōbus	red
4	Proto-Italic	rouβos	—
5	Proto-Indo-European	h₁rewdʰ-	red

Every word from Proto-Indo-European h₁rewdʰ- →Every word from Proto-Italic rouβos →Every word from Latin rōbus →