infrahepatic

The story

1. Proto-Indo-European*h₁én
2. Proto-Italic*en
3. Proto-Italic*en-
4. Latinin-
5. Proto-Indo-European*bʰer-
6. Proto-Indo-European*bʰéreti
7. Proto-Italic*ferō
8. Latinferō
9. Latinīnferō
10. Latinīnfrā
11. Englishinfra-
12. Proto-Indo-European*(H)yekʷ-
13. Proto-Indo-European*yókʷr̥
14. Proto-Hellenic*yêkʷər
15. Ancient Greekἧπαρ (hêpar)
16. Ancient Greekἡπατικός (hēpatikós)
17. Late Latinhepaticus
18. Middle Englishepatik
19. Englishhepatic
20. English todayinfrahepatic

From infra- + hepatic.