Where does “oleo-” come from?

oleo- (English) comes from Latin oleum, from Ancient Greek ἔλαιον, from Ancient Greek ἐλαία, from Proto-Hellenic elaíwā, from Proto-Indo-European loiwom.

oleo- (English): oil or oil-based materials

Definitions

oil or oil-based materials

Ancestry of “oleo-”, step by step

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

Words derived from “oleo-”

oleoresin
oleograph
oleochemical
oleocystidium
oleocellosis
oleomancy

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