Assertion: crude oil | /r/HasProperty | élaion
Facets:
Source sentences:
text: The word petroleum comes from Medieval Latin petroleum (literally "rock oil"), which comes from Latin petra', "rock", (from Ancient Greek: πέτρα, romanized: petra, "rock") and Latin oleum, "oil", (from Ancient Greek: ἔλαιον, romanized: élaion, "oil").