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Added 9 October 2026

oleum

/ˈoʊliəm/ noun

Latin root: oleum Wiktionary

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about oleum at Wordnik → Where our words come from →

A solution of sulfur trioxide in sulfuric acid.

Origin

From German Oleum, from Latin oleum (“olive oil”), from Ancient Greek ἔλαιον (élaion, “olive oil”). Doublet of oil.

From Wiktionary, via Kaikki.org (CC BY-SA)

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