gonadotrope

The story

1. Proto-Indo-European*ǵenh₁-redup.
2. Proto-Indo-European*ǵíǵn̥h₁eti
3. Proto-Hellenic*gígnomai
4. Ancient Greekγίγνομαι (gígnomai)
5. Ancient Greekγονή (gonḗ)
6. New Latingonadēs
7. Englishgonad
8. Englishgonado-
9. Proto-Indo-European*trep-
10. Ancient Greekτρέπω (trépō)
11. Ancient Greekτρόπος (trópos)
12. Latintropus
13. English todaygonadotrope

From gonado- + -trope.