bioeffective

The story

1. Proto-Indo-European*gʷeyh₃-
2. Ancient Greekβῐ́ος (bĭ́os)
3. Ancient Greekβῐο- (bĭo-)
4. Englishbio-
5. Proto-Indo-European*h₁éǵʰ
6. Proto-Indo-European*h₁éǵʰs
7. Proto-Italic*eks
8. Latinex
9. Latinex-
10. Proto-Indo-European*dʰeh₁-
11. Proto-Indo-European*dʰeh₁k-
12. Proto-Indo-European*dʰh₁kyéti
13. Proto-Italic*θakjō
14. Proto-Italic*fakjō
15. Latinfaciō
16. Latinefficiō
17. Latineffectīvu
18. Frencheffectif
19. Englisheffective
20. English todaybioeffective

From bio- + effective.