geometrodynamics

The story

1. Proto-Hellenic*gaya
2. Ancient Greekγαῖᾰ (gaîă)clip.
3. Ancient Greekγῆ (gê)
4. Ancient Greekγεω- (geō-)
5. Proto-Indo-European*med-
6. Proto-Indo-European*meh₁-
7. Ancient Greekμέτρον (métron)
8. Ancient Greekγεωμετρῐ́ᾱ (geōmetrĭ́ā)
9. Latingeōmetria
10. Old Frenchgeometrie
11. Middle Englishgemetry
12. Englishgeometry
13. Proto-Indo-European*dewh₂-
14. Proto-Hellenic*dunamai
15. Ancient Greekδῠ́νᾰμαι (dŭ́nămai)
16. Ancient Greekδύναμις (dúnamis)
17. Ancient Greekδυναμικός (dunamikós)
18. Frenchdynamique
19. Englishdynamic
20. Englishdynamics
21. English todaygeometrodynamics

From geometry + -o- + dynamics.