hyperaltruism

The story

1. Proto-Indo-European*úp
2. Proto-Indo-European*upér
3. Proto-Hellenic*hupér
4. Ancient Greekῠ̔πέρ (hŭpér)
5. Ancient Greekῠ̔περ- (hŭper-)
6. Englishhyper-
7. Proto-Indo-European*h₂el-
8. Proto-Indo-European*h₂élyos
9. Proto-Italic*aljos
10. Proto-Italic*aliteros
11. Latinalterī
12. Vulgar Latin*alterui
13. Old Frenchautrui
14. Frenchautrui
15. Frenchaltruisme
16. Englishaltruism
17. English todayhyperaltruism

From hyper- + altruism.