Where does “cúis” come from?

cúis (Middle Irish) comes from Old Irish caus, from Latin causa, from Old Latin caussa, from Proto-Indo-European kawd-teh₂.

Ancestry of “cúis”, step by step

StepLanguageWordMeaning
1Old Irishcaus—
2Latincausacause, reason; case, claim, contention; motive,...
3Old Latincaussacause, reason, purpose; case, claim; Archaic form...
4Proto-Indo-Europeankawd-teh₂—

Words derived from “cúis”

Every word from Proto-Indo-European kawd-teh₂ →Every word from Old Latin caussa →Every word from Latin causa →