montirelin

The story

1. Proto-Indo-European*dʰewh₂-der.?
2. Ancient Greekθέειον (théeion)
3. Ancient Greekθεῖον (theîon)
4. Englishthio-
5. Englishmorpholine
6. Englishthiomorpholine
7. Proto-Indo-European*dʰwer-
8. Proto-Hellenic*tʰurā
9. Ancient Greekθῠ́ρᾱ (thŭ́rā)
10. Ancient Greekθῠρεός (thŭreós)
11. Proto-Indo-European*weyd-
12. Proto-Indo-European*wéydos
13. Proto-Hellenic*wéidos
14. Ancient Greekεἶδος (eîdos)
15. Ancient Greekθῠρεοειδής (thŭreoeidḗs)
16. New Latinthyreoīdēs
17. Englishthyroid
18. Englishthyro-
19. Proto-Indo-European*trep-
20. Ancient Greekτρέπω (trépō)
21. Ancient Greekτροπή (tropḗ)
22. Ancient Greekτροπῐκός (tropĭkós)
23. Englishthyrotropin
24. Proto-Italic*wre-
25. Latinre-
26. Old Frenchre-
27. Proto-Indo-European*(s)leg-
28. Proto-Indo-European*(s)leg-s-ós
29. Latinlaxus
30. Latinlaxō
31. Vulgar Latin*laxicāre
32. Vulgar Latin*lassicāre
33. Old Frenchlaschier
34. Old Frenchrelaschier
35. Old Frenchrelaisser
36. Middle Englishrelesen
37. Englishrelease
38. English todaymontirelin

From (thio)mo(rpholi)n(e) + -tirelin (“thyrotropin releasing hormone analog”).