thyroprotection

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. Proto-Indo-European*per-der.?
14. Proto-Indo-European*pér
15. Proto-Indo-European*pró
16. Proto-Indo-European*pro-
17. Proto-Italic*pro-
18. Latinpro-
19. Proto-Indo-European*(s)teg-
20. Proto-Indo-European*(s)tégeti
21. Proto-Italic*tegō
22. Latintegō
23. Latinprōtegō
24. Late Latinprōtēctiō
25. Englishprotection
26. English todaythyroprotection

From thyro- + protection.