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): /ˈo.le.um/, [ˈɔɫ̪eʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈo.le.um/, [ˈɔːleum]

oleum n (genitive oleī); second declension

1. olive oil
2. the palaestra

• Italo-Romance:
  • Italian: olio, oglio (dialectal)
    • → Bulgarian: о́лио (ólio)
  • Sicilian: ogghiu
• Padanian:
  • Gallo-Italic
    • Emilian: òli
    • Lombard: œli
    • Piedmontese: euli
    • Romagnol: öli
  • Friulian: vueli
  • Romansch: ieli, öli
  • Venetan: ojo
• Gallo-Romance:
  • Catalan: oli
  • Franco-Provençal: ôlyo
  • Old French: oile (see there for further descendants)
  • Occitan: òli
• Ibero-Romance: (all borrowed?)
  • Aragonese: olio
  • Asturian: oleu
  • Old Galician-Portuguese:
    • Galician: óleo
    • Portuguese: óleo
  • Spanish: óleo
• Insular Romance:
  • Sardinian: ozu

Borrowings:

• → Basque: olio
• → Faroese: olja
• → German: Oleum
  • → English: oleum
• → Hungarian: olaj
• → Old Irish: olae
  • Irish: ola
  • Scottish Gaelic: ola
• → Proto-West Germanic: *oli (see there for further descendants)
• >? Proto-Slavic: *olějь (see there for further descendants)
• → Romanian: oleu
• → Russian: о́леум (óleum)
• → Serbo-Croatian: ulje / уље
• → Welsh: olew

• “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