parathormone

The story

1. Proto-Indo-European*per-
2. Proto-Indo-European*preh₂-
3. Proto-Hellenic*pərai
4. Ancient Greekπᾰρᾰ́ (părắ)
5. Ancient Greekπᾰρᾰ- (pără-)
6. Englishpara-
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. Englishparathyroid
19. Ancient Greekὁρμή (hormḗ)
20. Ancient Greekὁρμῶν (hormôn)
21. Englishhormone
22. English todayparathormone

Blend of parathyroid + hormone.