arytenoidal

The story

1. Ancient Greekᾰ̓ρῠ́ω (ărŭ́ō)
2. Ancient Greekᾰ̓ρῠτήρ (ărŭtḗr)
3. Ancient Greekᾰ̓ρῠ́ταινᾰ (ărŭ́taină)
4. Proto-Indo-European*weyd-
5. Proto-Indo-European*wéydos
6. Proto-Hellenic*wéidos
7. Ancient Greekεἶδος (eîdos)
8. Ancient Greekᾰ̓ρῠταινοειδής (ărŭtainoeidḗs)
9. New Latinarytaenoīdēs
10. Englisharytenoid
11. Proto-Indo-European*h₂el-
12. Proto-Indo-European*h₂élisder.?
13. English todayarytenoidal

From arytenoid + -al.