synaptoplastic

The story

1. Proto-Indo-European*ḱe?
2. Proto-Indo-European*ḱómder.?
3. Proto-Indo-European*sem-der.?
4. Proto-Hellenic*ksún
5. Ancient Greekσύν (sún)
6. Ancient Greekσυν- (sun-)
7. Proto-Hellenic*áptō
8. Ancient Greekἅπτω (háptō)
9. Ancient Greekσῠνᾰ́πτω (sŭnắptō)
10. Englishsynapto-
11. Proto-Hellenic*plátʰyō
12. Proto-Hellenic*plát͏̌t͏̌ō?
13. Ancient Greekπλάσσω (plássō)
14. Ancient Greekπλᾰστῐκός (plăstĭkós)
15. Latinplasticus
16. Englishplastic
17. English todaysynaptoplastic

From synapto- + plastic.