microanatomically

The story

1. Proto-Indo-European*mey-der.?
2. Ancient Greekμῑκρός (mīkrós)
3. Ancient Greekμῑκρο- (mīkro-)
4. Englishmicro-
5. Proto-Indo-European*h₂en-
6. Proto-Hellenic*aná
7. Ancient Greekᾰ̓νᾰ́ (ănắ)
8. Ancient Greekἀνα- (ana-)
9. Proto-Indo-European*temh₁-
10. Ancient Greekτέμνω (témnō)
11. Ancient Greekἀνατέμνω (anatémnō)
12. Ancient Greekἀνατομή (anatomḗ)
13. Latinanatomia
14. Frenchanatomie
15. Frenchanatomique
16. Latinanatomicus
17. Englishanatomic
18. Proto-Indo-European*h₂el-
19. Proto-Indo-European*h₂élisder.?
20. Englishanatomical
21. Englishmicro-
22. Latinanatomia
23. Old Frenchanatomie
24. Middle Englishanatomie
25. Englishanatomy
26. Englishmicroanatomy
27. Englishmicroanatomical
28. Proto-Indo-European*leyg-
29. Proto-Germanic*līką
30. English todaymicroanatomically

From microanatomical + -ly.