Where does “poligon” come from?

poligon (Polish) comes from French polygone, from Latin polygonum, from Ancient Greek πολύγωνον, from Ancient Greek πολύγωνος, from Ancient Greek γωνία, from Ancient Greek γόνυ, from Proto-Hellenic gónu, from Proto-Indo-European ǵónu — knee.

poligon (Polish): proving ground, firing range; an area where military trials with live ammunition are performed

Definitions

proving ground, firing range; an area where military trials with live ammunition are performed

Ancestry of “poligon”, step by step

Step	Language	Word	Meaning
1	French	polygone	polygon
2	Latin	polygonum	polygon
3	Ancient Greek	πολύγωνον	polygon
4	Ancient Greek	πολύγωνος	polygonal, many-angled
5	Ancient Greek	γωνία	corner, angle; joiner's square; cornerstone
6	Ancient Greek	γόνυ	knee
7	Proto-Hellenic	gónu	knee
8	Proto-Indo-European	ǵónu	knee

Every word from Proto-Indo-European ǵónu →Every word from Proto-Hellenic gónu →Every word from Ancient Greek γόνυ →