Where does “ruginiu” come from?

ruginiu (Romanian) comes from Romanian rugină, from Latin aerūgina, from Latin aerūgō, from Latin aes, from Proto-Italic aos, from Proto-Italic ajos, from Proto-Indo-European h₂éyos — a metal, copper, bronze.

ruginiu (Romanian): rust-colored

Definitions

rust-colored

Ancestry of “ruginiu”, step by step

Step	Language	Word	Meaning
1	Romanian	rugină	rust
2	Latin	aerūgina	—
3	Latin	aerūgō	rust of copper, verdigris
4	Latin	aes	money, pay, fee, fare; copper, bronze, brass;...
5	Proto-Italic	aos	bronze, copper
6	Proto-Italic	ajos	—
7	Proto-Indo-European	h₂éyos	a metal, copper, bronze

Every word from Proto-Indo-European h₂éyos →Every word from Proto-Italic ajos →Every word from Proto-Italic aos →