Where does “*rād-” come from?
*rād- (Proto-Iranian) comes from Proto-Indo-Iranian HraHdʰ-, from Proto-Indo-European Hreh₁dʰ-, from Proto-Indo-European h₂reh₁-, from Proto-Indo-European h₂er- — to fit, to fix, to put together.
Ancestry of “*rād-”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Proto-Indo-Iranian | HraHdʰ- | — |
| 2 | Proto-Indo-European | Hreh₁dʰ- | to think; to arrange; to succeed, accomplish |
| 3 | Proto-Indo-European | h₂reh₁- | to think, reason; to arrange |
| 4 | Proto-Indo-European | h₂er- | to fit, to fix, to put together |