Where does “олѣ́й” come from?

олѣ́й (Old East Slavic) comes from Old East Slavic олѣи, from Proto-Slavic olejь, from Latin oleum, from Ancient Greek ἔλαιον, from Ancient Greek ἐλαία, from Proto-Hellenic elaíwā, from Proto-Indo-European loiwom.

Ancestry of “олѣ́й”, step by step

Step	Language	Word	Meaning
1	Old East Slavic	олѣи	—
2	Proto-Slavic	olejь	oil, olive oil
3	Latin	oleum	olive oil; the palaestra
4	Ancient Greek	ἔλαιον	olive oil, commonly used as an anointing oil; any...
5	Ancient Greek	ἐλαία	olive tree; olive; naevus
6	Proto-Hellenic	elaíwā	—
7	Proto-Indo-European	loiwom	—

Words derived from “олѣ́й”

олія
олі́йник
олійництво
олійниченко

Every word from Proto-Indo-European loiwom →Every word from Proto-Hellenic elaíwā →Every word from Ancient Greek ἐλαία →