The story
- Proto-Indo-European*ḱe?
- Proto-Indo-European*ḱómder.?
- Proto-Indo-European*sem-der.?
- Proto-Hellenic*ksún
- Ancient Greekσύν (sún)
- Ancient Greekσυν- (sun-)
- Proto-Hellenic*áptō
- Ancient Greekἅπτω (háptō)
- Ancient Greekσῠνᾰ́πτω (sŭnắptō)
- English todaysynapto-
Borrowed from Ancient Greek σῠνᾰ́πτω (sŭnắptō, “to conjoin, to connect”).
Etymology from Wiktionary, CC BY-SA 4.0.