biosynthetic

The story

1. Proto-Indo-European*gʷeyh₃-
2. Ancient Greekβῐ́ος (bĭ́os)
3. Ancient Greekβῐο- (bĭo-)
4. Englishbio-
5. Proto-Indo-European*ḱe?
6. Proto-Indo-European*ḱómder.?
7. Proto-Indo-European*sem-der.?
8. Proto-Hellenic*ksún
9. Ancient Greekσύν (sún)
10. Ancient Greekσυν- (sun-)
11. Proto-Indo-European*dʰeh₁-
12. Proto-Indo-European*dʰédʰeh₁ti
13. Ancient Greekτίθημι (títhēmi)
14. Ancient Greekσῠντῐ́θημῐ (sŭntĭ́thēmĭ)
15. Ancient Greekσύνθεσις (súnthesis)
16. Ancient Greekσυνθετικός (sunthetikós)
17. Frenchsynthétique
18. Englishsynthetic
19. English todaybiosynthetic

From bio- + synthetic.