interarytenoid

The story

1. Proto-Indo-European*h₁én
2. Proto-Indo-European*h₁n̥tér
3. Proto-Italic*n̥ter
4. Latininter
5. Latininter-
6. Englishinter-
7. Ancient Greekᾰ̓ρῠ́ω (ărŭ́ō)
8. Ancient Greekᾰ̓ρῠτήρ (ărŭtḗr)
9. Ancient Greekᾰ̓ρῠ́ταινᾰ (ărŭ́taină)
10. Proto-Indo-European*weyd-
11. Proto-Indo-European*wéydos
12. Proto-Hellenic*wéidos
13. Ancient Greekεἶδος (eîdos)
14. Ancient Greekᾰ̓ρῠταινοειδής (ărŭtainoeidḗs)
15. New Latinarytaenoīdēs
16. Englisharytenoid
17. English todayinterarytenoid

From inter- + arytenoid.