Where does “pentágono” come from?

pentágono (Galician) 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.

pentágono (Galician): pentagon

Definitions

pentagon

Ancestry of “pentágono”, step by step

Step	Language	Word	Meaning
1	Late Latin	pentagonum	pentaphyllon
2	Ancient Greek	πεντάγωνον	pentagon
3	Ancient Greek	πεντάγωνος	five-angled
4	Ancient Greek	γωνία	corner, angle; joiner's square; cornerstone
5	Ancient Greek	γόνυ	knee
6	Proto-Hellenic	gónu	knee
7	Proto-Indo-European	ǵónu	knee

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