Where does “اسپیداج” come from?

اسپیداج (Persian) comes from Persian سپید, from Middle Persian spyt', from Proto-Iranian *cwaytáh, from Proto-Indo-Iranian *ćwaytás, from Proto-Indo-European ḱweytós — white; bright; shine.

Ancestry of “اسپیداج”, step by step

StepLanguageWordMeaning
1Persianسپیدwhite; fair; pale
2Middle Persianspyt'white
3Proto-Iranian*cwaytáhwhite
4Proto-Indo-Iranian*ćwaytáswhite
5Proto-Indo-Europeanḱweytóswhite; bright; shine
Every word from Proto-Indo-European ḱweytós →Every word from Proto-Indo-Iranian *ćwaytás →Every word from Proto-Iranian *cwaytáh →