resorantel

The story

1. Ancient Greekῥητῑ́νη (rhētī́nē)
2. Latinrēsīna
3. Old Frenchrésine
4. Middle Englishresyn
5. Englishresin
6. Proto-Indo-European*h₂ew-
7. Proto-Indo-European*h₂ṓws
8. Proto-Italic*ausis
9. Latinauris
10. Latinauricula
11. Latinōricula
12. Italianoricello
13. Arabic[script needed] ('urjālla)influ.
14. Old Catalanorxella
15. Old Frenchorchel
16. Frenchorseille
17. Dutchorseille
18. New Latinorcina
19. Frenchorcine
20. Englishorcin
21. Englishresorcin
22. Proto-Indo-European*h₂ent-
23. Proto-Indo-European*h₂énts
24. Proto-Indo-European*h₂énti
25. Ancient Greekᾰ̓ντῐ́ (ăntĭ́)
26. Ancient Greekἀντι- (anti-)
27. Englishanti-
28. Englishant-
29. Ancient Greekἕλμῐνς (hélmĭns)
30. Englishhelminth
31. Englishanthelmintic
32. English todayresorantel

From resor(cin) + -antel (“anthelminthic”).