Where does “bithbinech” come from?

bithbinech (Middle Irish) comes from Old Irish bíth, from Proto-Celtic bitus, from Proto-Indo-European gʷiH-tu- — life.

Ancestry of “bithbinech”, step by step

StepLanguageWordMeaning
1Old Irishbíthinflection of at·tá: ## third-person singular...
2Proto-Celticbitusworld
3Proto-Indo-EuropeangʷiH-tu-life
Every word from Proto-Indo-European gʷiH-tu- →Every word from Proto-Celtic bitus →Every word from Old Irish bíth →