clinically

The story

1. Proto-Indo-European*ḱel-
2. Proto-Indo-European*ḱley-
3. Proto-Indo-European*ḱl̥néyti
4. Proto-Hellenic*klíňňō
5. Ancient Greekκλῑ́νω (klī́nō)
6. Ancient Greekκλῑ́νη (klī́nē)
7. Ancient Greekκλῑνῐκός (klīnĭkós)
8. Late Latinclīnicus
9. Frenchclinique
10. Englishclinic
11. Proto-Indo-European*h₂el-
12. Proto-Indo-European*h₂élisder.?
13. Englishclinical
14. Proto-Indo-European*leyg-
15. Proto-Germanic*līką
16. English todayclinically

From clinical + -ly.