Assertion: crude oil | /r/HasProperty | ἔλαιον
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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").