# rock oil

> English word · Noun

## Definitions
1. Naphtha (liquid petroleum).
2. Petroleum

## Etymology
From rock + oil, a literal rendering of Latin petroleum (literally “rock oil”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/rock-oil