Where does “r-” come from?
r- (Irish) comes from Irish ríomh-, from Irish ríomh, from Old Irish rím, from Proto-Celtic rīmā, from Proto-Indo-European h₂rey-, from Proto-Indo-European h₂er- — to fit, to fix, to put together.
r- (Irish): e-
Ancestry of “r-”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Irish | ríomh- | computer; electronic, e- |
| 2 | Irish | ríomh | verbal noun of ríomh; enumeration; calculation,... |
| 3 | Old Irish | rím | verbal noun of rímid; act of counting,... |
| 4 | Proto-Celtic | rīmā | number |
| 5 | Proto-Indo-European | h₂rey- | to count, count out; to arrange |
| 6 | Proto-Indo-European | h₂er- | to fit, to fix, to put together |