Where does “horizontal” come from?

horizontal (Middle French) comes from Latin horizōn, from Ancient Greek ὁρίζων, from Ancient Greek ὅρος, from Proto-Hellenic wórwos, from Proto-Indo-European werw-.

Ancestry of “horizontal”, step by step

StepLanguageWordMeaning
1Latinhorizōnhorizon
2Ancient Greekὁρίζωνhorizon
3Ancient Greekὅροςboundary, limit, frontier, landmark; marking...
4Proto-Hellenicwórwos—
5Proto-Indo-Europeanwerw-—

Words derived from “horizontal”

Every word from Proto-Indo-European werw- →Every word from Proto-Hellenic wórwos →Every word from Ancient Greek ὅρος →