oleum

From German Oleum,^[1] from Latin oleum (“olive oil”), from Ancient Greek ἔλαιον (élaion, “olive oil”). Doublet of oil.

• (General American) IPA^(key): /oʊliəm/

oleum (countable and uncountable, plural oleums)

1. (inorganic chemistry) A solution of sulfur trioxide in sulfuric acid.

• fuming sulfuric acid

• Olea

• pyrosulfuric acid

From Ancient Greek ἔλαιον (élaion, “olive oil”).

• (Classical Latin) IPA^(key): [ˈɔ.ɫe.ũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈɔː.le.um]

oleum n (genitive oleī); second declension

1. olive oil
2. the palaestra

Second-declension noun (neuter).

Borrowings:

• “oleum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “oleum”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• "oleum", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• oleum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎^[1], London: Macmillan and Co.
  • to lose one's labour: operam (et oleum) perdere or frustra consumere
    
• “oleum”, in Harry Thurston Peck, editor (1898), Harper’s Dictionary of Classical Antiquities, New York: Harper & Brothers

Borrowed from French oléum.

oleum n (uncountable)

1. oleum