Where does “deog” come from?

deog (Old Irish) comes from Old Irish deug, from Proto-Celtic dī-āti-s, from Proto-Indo-European dʰeh₁(y)- — to suckle, nurse.

Ancestry of “deog”, step by step

StepLanguageWordMeaning
1Old Irishdeugdrink; draught; potion
2Proto-Celticdī-āti-s—
3Proto-Indo-Europeandʰeh₁(y)-to suckle, nurse
Every word from Proto-Indo-European dʰeh₁(y)- →Every word from Proto-Celtic dī-āti-s →Every word from Old Irish deug →