Where does “олѣи” come from?

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

олѣи (Old Church Slavonic): oil

Definitions

Ancestry of “олѣи”, step by step

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

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