Where does “vertical” come from?

vertical (Middle French) comes from Latin verticālis, from Latin vertex, from Latin vertō, from Proto-Italic wertō, from Proto-Indo-European wert-, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

Ancestry of “vertical”, step by step

StepLanguageWordMeaning
1Latinverticālishighest in the hierarchy
2Latinvertexwhirlpool, eddy, vortex; crown; top, peak, summit
3Latinvertōto turn, turn oneself, direct one's way, to turn about, turn around, revolve
4Proto-Italicwertōto turn
5Proto-Indo-Europeanwert-to turn, to rotate
6Proto-Indo-Europeanwer-to burn; to cover, heed, notice; squirrel

Words derived from “vertical

Every word from Proto-Indo-European wer-