cricoidal

The story

1. Ancient Greekκρῐ́κος (krĭ́kos)
2. Proto-Indo-European*weyd-
3. Proto-Indo-European*wéydos
4. Proto-Hellenic*wéidos
5. Ancient Greekεἶδος (eîdos)
6. Ancient Greekκρῐκοειδής (krĭkoeidḗs)
7. New Latincricoīdēs
8. Englishcricoid
9. Proto-Indo-European*h₂el-
10. Proto-Indo-European*h₂élisder.?
11. English todaycricoidal

From cricoid + -al.