noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A solution of sulfur trioxide in sulfuric acid. countable, uncountable

Synonyms

All synonyms

esterfatfuming sulfuric acidfuming sulfuric acidgreaselipid

Etymology

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

Related phrases

pyrosulfuric acidsulfur trioxidesulfuric acid

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.