The story
- Proto-Indo-European*ǵónu
- Proto-Hellenic*gónu
- Proto-Hellenic*gonwía
- Ancient Greekγωνίᾱ (gōníā)
- Englishgonio-
- Proto-Hellenic*plátʰyō
- Proto-Hellenic*plát͏̌t͏̌ō?
- Ancient Greekπλᾰ́σσω (plắssō)
- Ancient Greekπλᾰστός (plăstós)
- English todaygonioplasty
Etymology from Wiktionary, CC BY-SA 4.0.