Where does “katarás” come from?

katarás (Proto-Indo-Aryan) comes from Proto-Indo-Iranian kátaras, from Proto-Indo-European kʷóteros, from Proto-Indo-European kʷos, from Proto-Indo-European kʷ- — The primary interrogative root.

Ancestry of “katarás”, step by step

StepLanguageWordMeaning
1Proto-Indo-Iraniankátaras—
2Proto-Indo-Europeankʷóteroswhich of two
3Proto-Indo-EuropeankʷosSee *kʷis
4Proto-Indo-Europeankʷ-The primary interrogative root
Every word from Proto-Indo-European kʷ- →Every word from Proto-Indo-European kʷos →Every word from Proto-Indo-European kʷóteros →