Where does “killioù” come from?

killioù (Breton) comes from Breton killi, from Proto-Brythonic *kėlli, from Proto-Celtic kallī, from Proto-Indo-European kelh₂- — to beat; to break.

Definitions

Ancestry of “killioù”, step by step

StepLanguageWordMeaning
1Bretonkilligrove
2Proto-Brythonic*kėlli—
3Proto-Celtickallīgrove, forest
4Proto-Indo-Europeankelh₂-to beat; to break
Every word from Proto-Indo-European kelh₂- →Every word from Proto-Celtic kallī →Every word from Proto-Brythonic *kėlli →