Where does “déniu” come from?

déniu (Old Irish) comes from Old Irish dían, from Celtic *deinos, from Proto-Indo-European deyh₁- — to hurtle, to chase.

Ancestry of “déniu”, step by step

StepLanguageWordMeaning
1Old Irishdíanswift, rapid, sudden, hasty; impetuous, vehement,...
2Celtic*deinos—
3Proto-Indo-Europeandeyh₁-to hurtle, to chase
Every word from Proto-Indo-European deyh₁- →Every word from Celtic *deinos →Every word from Old Irish dían →