Where does “tritheistical” come from?

tritheistical (English) comes from English tri, from Proto-Indo-European tréyes — three.

tritheistical (English): Of or relating to tritheism

Definitions

  1. Of or relating to tritheism

Ancestry of “tritheistical”, step by step

tritheistical traces back through two separate lines of ancestry.

via English tri

StepLanguageWordMeaning
1Englishtritriathlon; triangle
2Proto-Indo-Europeantréyesthree

via English theistical

StepLanguageWordMeaning
1Englishtheisticalof or relating to theism
Every word from Proto-Indo-European tréyes →Every word from English tri →