The story
- Proto-Indo-European*ser-?
- Proto-Indo-European*srew-
- Proto-Indo-European*sréweti
- Proto-Hellenic*hréwō
- Ancient Greekῥέω (rhéō)
- Englishrheo-
- Proto-Indo-European*ǵónu
- Proto-Hellenic*gónu
- Proto-Hellenic*gonwía
- Ancient Greekγωνίᾱ (gōníā)
- Englishgonio-
- Proto-Indo-European*med-
- Proto-Indo-European*meh₁-
- Ancient Greekμέτρον (métron)
- Englishgoniometry
- English todayrheogoniometry
From rheo- + goniometry.
Etymology from Wiktionary, CC BY-SA 4.0.