phytobiology

The story

1. Proto-Indo-European*bʰuH-
2. Proto-Indo-European*bʰuHyéti
3. Ancient Greekφῠ́ω (phŭ́ō)
4. Ancient Greekφῠτός (phŭtós)
5. Ancient Greekφῠτόν (phŭtón)
6. Englishphyto-
7. Proto-Indo-European*gʷeyh₃-
8. Ancient Greekβίος (bíos)
9. Proto-Indo-European*leǵ-
10. Proto-Indo-European*lóǵos
11. Proto-Hellenic*lógos
12. Ancient Greekλόγος (lógos)
13. New Latinbiologia
14. Englishbiology
15. English todayphytobiology

From phyto- + biology.