Where does “εκλείπτης” come from?

εκλείπτης (Greek) comes from Greek εκλείπω, from Ancient Greek ἐκλείπω, from Ancient Greek ἐκ, from Proto-Hellenic *eks.

Ancestry of “εκλείπτης”, step by step

Step	Language	Word	Meaning
1	Greek	εκλείπω	to vanish, become extinct
2	Ancient Greek	ἐκλείπω	I leave out, pass over; I forsake, desert,...
3	Ancient Greek	ἐκ	Out of, from; from, with the source of; to denote...
4	Proto-Hellenic	*eks	—