Where does “trinoculars” come from?

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

trinoculars (English): A notional set of binoculars for a three-eyed being

Definitions

  1. A notional set of binoculars for a three-eyed being

Ancestry of “trinoculars”, step by step

trinoculars traces back through two separate lines of ancestry.

via English tri

StepLanguageWordMeaning
1Englishtritriathlon; triangle
2Proto-Indo-Europeantréyesthree

via English binoculars

StepLanguageWordMeaning
1EnglishbinocularsA hand-held device consisting of a series of lenses and prisms, used to magnify objects so that they can be better seen from a distance, and looked at through both eyes
Every word from Proto-Indo-European tréyes →Every word from English tri →