Oleum
/ˈoʊ.li.əm/noun
A liquid or oily substance, especially sulfuric acid dissolved in sulfur trioxide.
Did you know?Oleum comes straight from Latin oleum, the same source behind “oil,” and in Roman life oil was sacred enough to fuel lamps, anoint bodies, and mark religious rites.
Etymological Timeline
Proto-Indo-European
PIE
*h₁el- / *ol-
“A root associated with oil or olive trees in the ancient Mediterranean word family.”
Ancient Greek
Greek
elaia
“Olive tree; olive fruit.”
Classical Latin
Latin
oleum
“Olive oil; oil.”
Late Latin
Latin
oleum
“Oil, especially in learned and technical usage.”
Modern English
English
oleum
“A technical term for fuming sulfuric acid or an oily liquid in chemistry.”