neurobehavioral

The story

1. Proto-Indo-European*(s)neh₁-
2. Proto-Indo-European*snéh₁wr̥
3. Ancient Greekνεῦρον (neûron)
4. Ancient Greekνευρο- (neuro-)
5. Englishneuro-
6. Proto-Indo-European*h₁ep-
7. Proto-Indo-European*h₁éps
8. Proto-Indo-European*h₁épi
9. Proto-Indo-European*h₁pi
10. Proto-Germanic*bi
11. Proto-Germanic*bi-
12. Proto-West Germanic*bi-
13. Proto-Indo-European*kap-
14. Proto-Germanic*habjaną
15. Proto-West Germanic*habbjan
16. Proto-West Germanic*bihabbjan
17. Old Englishbehabban
18. Middle Englishbehaven
19. Proto-Indo-European*gʰeh₁bʰ-
20. Proto-Indo-European*gʰh₁bʰéh₁yeti
21. Proto-Italic*haβēō
22. Latinhabeō
23. Old Frenchavoir
24. Middle Englishhavour
25. Middle Englishbehavoure
26. Englishbehavior
27. Proto-Indo-European*h₂el-
28. Proto-Indo-European*h₂élisder.?
29. Englishbehavioral
30. English todayneurobehavioral

From neuro- + behavioral.