Where does “aur” come from?

aur (Gutnish) comes from Old Norse aurr, from Proto-Germanic auraz, from Proto-Indo-European Huh₁-ró-s, from Proto-Indo-European -rós — Forms adjectives from Caland system roots.

aur (Gutnish): gravel bank, gravel, rough sand, dry gravel soil,...

Definitions

gravel bank, gravel, rough sand, dry gravel soil,...

Ancestry of “aur”, step by step

Step	Language	Word	Meaning
1	Old Norse	aurr	moist earth, wet clay, mud
2	Proto-Germanic	auraz	wet sand or earth, mud; liquid, water, sea
3	Proto-Indo-European	Huh₁-ró-s	—
4	Proto-Indo-European	-rós	Forms adjectives from Caland system roots

Every word from Proto-Indo-European -rós →Every word from Proto-Indo-European Huh₁-ró-s →Every word from Proto-Germanic auraz →