Where does “equilateral” come from?

Equilateral comes from English lateral, with the prefix equi- and suffix -y, from Middle English -y, ultimately from Proto-Indo-European tl̥h₂tós through Latin -ia and -ivus formations.

equilateral (English): Having all the sides equal; Having all the faces...

Definitions

  1. Having all the sides equal; Having all the faces...

Ancestry of “equilateral”, step by step

StepLanguageWordMeaning
1EnglishlateralTo the side; of or pertaining to the side;...
2LatinlaterālisOf or belonging to the side; lateral
3Latinlātuswide, broad
4LatincaudaA tail
5Proto-Italickaudātail
6Proto-Indo-Europeankeh₂udeh₂—

Words derived from “equilateral”

Every word from Proto-Indo-European keh₂udeh₂ →