Where does “bith-” come from?
bith- (Old Irish) comes from Old Irish bíth, from Proto-Celtic bitus, from Proto-Indo-European gʷiH-tu- — life.
Ancestry of “bith-”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Old Irish | bíth | inflection of at·tá:
## third-person singular... |
| 2 | Proto-Celtic | bitus | world |
| 3 | Proto-Indo-European | gʷiH-tu- | life |