Where does “pentagone” come from?

pentagone (Middle French) comes from Late Latin pentagonum, from Ancient Greek πεντάγωνον, from Ancient Greek πεντάγωνος, from Ancient Greek γωνία, from Ancient Greek γόνυ, from Proto-Hellenic gónu, from Proto-Indo-European ǵónu — knee.

Ancestry of “pentagone”, step by step

StepLanguageWordMeaning
1Late Latinpentagonumpentaphyllon
2Ancient Greekπεντάγωνονpentagon
3Ancient Greekπεντάγωνοςfive-angled
4Ancient Greekγωνίαcorner, angle; joiner's square; cornerstone
5Ancient Greekγόνυknee
6Proto-Hellenicgónuknee
7Proto-Indo-Europeanǵónuknee

Words derived from “pentagone

Every word from Proto-Indo-European ǵónuEvery word from Proto-Hellenic gónuEvery word from Ancient Greek γόνυ