underperfusion

The story

1. Proto-Indo-European*h₁én
2. Proto-Indo-European*h₁entér
3. Proto-Indo-European*h₂én
4. Proto-Indo-European*dʰeh₁-?
5. Proto-Indo-European*(H)n̥dʰí
6. Proto-Indo-European*(H)n̥dʰér
7. Proto-Germanic*under
8. Proto-West Germanic*undar
9. Old Englishunder-
10. Middle Englishunder-
11. Englishunder-
12. Proto-Indo-European*per-
13. Proto-Italic*peri-
14. Latinper-
15. Proto-Indo-European*ǵʰew-
16. Proto-Indo-European*ǵʰewd-
17. Proto-Indo-European*ǵʰunédti
18. Proto-Italic*hundō
19. Latinfundō
20. Latinperfundō
21. Latinperfūsiō
22. Middle Frenchperfusion
23. Englishperfusion
24. English todayunderperfusion

From under- + perfusion.