frenectomy

The story

1. Proto-Indo-European*dʰer-
2. Proto-Indo-European*dʰr-eh₁-nom
3. Proto-Italic*θrēnom
4. Proto-Italic*frēnom
5. Latinfrēnum
6. Englishfrenum
7. Proto-Indo-European*h₁éǵʰ
8. Proto-Indo-European*h₁eǵʰs
9. Proto-Hellenic*eks
10. Ancient Greekἐκ (ek)
11. Ancient Greekἐκ- (ek-)
12. Proto-Indo-European*temh₁-
13. Ancient Greekτέμνω (témnō)
14. Ancient Greekἐκτέμνω (ektémnō)
15. Ancient Greekἐκτομή (ektomḗ)
16. English todayfrenectomy

From frenum + -ectomy.