thyrocalcitonin

The story

1. Proto-Indo-European*dʰwer-
2. Proto-Hellenic*tʰurā
3. Ancient Greekθῠ́ρᾱ (thŭ́rā)
4. Ancient Greekθῠρεός (thŭreós)
5. Proto-Indo-European*weyd-
6. Proto-Indo-European*wéydos
7. Proto-Hellenic*wéidos
8. Ancient Greekεἶδος (eîdos)
9. Ancient Greekθῠρεοειδής (thŭreoeidḗs)
10. New Latinthyreoīdēs
11. Englishthyroid
12. Englishthyro-
13. Ancient Greekχᾰ́λῐξ (khắlĭx)bor.?
14. Latincalx
15. Englishcalcium
16. Englishcalci-
17. Proto-Indo-European*ten-
18. Proto-Indo-European*tónos
19. Proto-Hellenic*tónos
20. Ancient Greekτόνος (tónos)
21. Ancient Greekτονῐκός (tonĭkós)
22. Englishtonic
23. Englishcalcitonin
24. English todaythyrocalcitonin

From thyro- + calcitonin.