Where does “trihelical” come from?

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

trihelical (English): Relating to or composed of three helices

Definitions

  1. Relating to or composed of three helices

Ancestry of “trihelical”, step by step

trihelical traces back through two separate lines of ancestry.

via English tri

StepLanguageWordMeaning
1Englishtritriathlon; triangle
2Proto-Indo-Europeantréyesthree

via English helical

StepLanguageWordMeaning
1EnglishhelicalIn the shape of a helix
Every word from Proto-Indo-European tréyes →Every word from English tri →