glossolabiolaryngeal

The story

1. Proto-Hellenic*glṓt͏̌t͏̌ā
2. Ancient Greekγλῶσσᾰ (glôssă)
3. Englishglosso-
4. Proto-Indo-European*leb-
5. Proto-Indo-European*l̥b-yóm
6. Proto-Italic*labjom
7. Latinlabium
8. Englishlabio-
9. Ancient Greekλᾰ́ρῠγξ (lắrŭnx)
10. Latinlarynx
11. New Latinlaryngeus
12. Proto-Indo-European*h₂el-
13. Proto-Indo-European*h₂élisder.?
14. Englishlaryngeal
15. English todayglossolabiolaryngeal

From glosso- + labio- + laryngeal.