magnetodynamic

The story

1. Ancient GreekΜάγνης (Mágnēs)
2. Ancient Greekμᾰ́γνης (mắgnēs)
3. Old Frenchmagnete
4. Ancient Greekμᾰ́γνης (mắgnēs)
5. Latinmagnēs
6. Middle Englishmagnete
7. Englishmagnet
8. Englishmagnet-
9. Englishmagneto-
10. Proto-Indo-European*dewh₂-
11. Proto-Hellenic*dunamai
12. Ancient Greekδῠ́νᾰμαι (dŭ́nămai)
13. Ancient Greekδύναμις (dúnamis)
14. Ancient Greekδυναμικός (dunamikós)
15. Frenchdynamique
16. Englishdynamic
17. English todaymagnetodynamic

From magneto- + dynamic.