Where does “про-” come from?
про- (Old Church Slavonic) comes from Proto-Slavic pro-, from Proto-Slavic *pro, from Proto-Balto-Slavic *pra, from Proto-Indo-European pró, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.
Ancestry of “про-”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Proto-Slavic | pro- | — |
| 2 | Proto-Slavic | *pro | — |
| 3 | Proto-Balto-Slavic | *pra | — |
| 4 | Proto-Indo-European | pró | toward, leading to |
| 5 | Proto-Indo-European | per- | before, in front; first; to go through |
| 6 | Proto-Indo-European | pr̥tós | passed , crossed |
Words derived from “про-”