Where does “ro-” come from?
ro- (Middle Irish) comes from Old Irish ro-, from Proto-Celtic ɸro-, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.
Ancestry of “ro-”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Old Irish | ro- | indicates a perfective aspect; indicates... |
| 2 | Proto-Celtic | ɸro- | before, in front of; in addition; to completion |
| 3 | Proto-Indo-European | per- | before, in front; first; to go through |
| 4 | Proto-Indo-European | pr̥tós | passed , crossed |