antithyroid

The story

1. Proto-Indo-European*h₂ent-
2. Proto-Indo-European*h₂énts
3. Proto-Indo-European*h₂énti
4. Ancient Greekᾰ̓ντῐ́ (ăntĭ́)
5. Ancient Greekἀντι- (anti-)
6. Englishanti-
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. English todayantithyroid

Coined in 1908 from anti- + thyroid.