Where does “rock oil” come from?

rock oil (English) comes from English Rock, from English rock and roll, from English and, from Middle English an, from Old English ond, from Old English and, from Proto-Germanic andi, from Proto-Indo-European h₂énti — on, onto.

Ancestry of “rock oil”, step by step

rock oil traces back through two separate lines of ancestry.

via English Rock

StepLanguageWordMeaning
1EnglishRockfor someone living near a rock or an oak (atter + oke)
2Englishrock and rollA genre of popular music that evolved in the...
3EnglishandAs a coordinating conjunction; expressing two...
4Middle EnglishanAlternative form of in; Alternative form of and;...
5Old Englishondand
6Old Englishandand; even; also
7Proto-Germanicandiin addition, furthermore, and
8Proto-Indo-Europeanh₂éntiopposite; near; in front
9Proto-Indo-Europeanh₂éntsforehead; front
10Proto-Indo-Europeanh₂ent-face; forehead; front
11Proto-Indo-Europeanh₂en-on, onto

via English oil

StepLanguageWordMeaning
1EnglishoilLiquid fat; Petroleum-based liquid used as fuel...
2Middle EnglishoyleThe oil pressed from olives; olive oil; Oil as...
3Old Frenchoileoil
4Latinoleumolive oil; the palaestra
5Ancient Greekἔλαιονolive oil, commonly used as an anointing oil; any...
6Ancient Greekἐλαίαolive tree; olive; naevus
7Proto-Hellenicelaíwā
8Proto-Indo-Europeanloiwom

Words derived from “rock oil

Every word from Proto-Indo-European h₂en-