Standard Lemma guide

oleum

noun · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • General-American: /oʊliəm/

1

noun

Meaning 1

A solution of sulfur trioxide in sulfuric acid.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: chemistry, inorganic-chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

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

Across languages

Translations

11 source translations are retained for this English entry.

  • Bulgarian: димяща сярна киселина (dimjašta sjarna kiselina) — fuming sulfuric acid
  • Catalan: òleum — fuming sulfuric acid
  • Chinese Mandarin: 發煙硫酸 /发烟硫酸 (fāyānliúsuān) — fuming sulfuric acid
  • Finnish: sumuava rikkihappo — fuming sulfuric acid
  • Finnish: savuava rikkihappo — fuming sulfuric acid
  • French: oléum — fuming sulfuric acid
  • German: Oleum — fuming sulfuric acid
  • German: rauchende Schwefelsäure — fuming sulfuric acid
  • Japanese: 発煙硫酸 (hatsuenryūsan) — fuming sulfuric acid
  • Korean: 발연황산 (baryeonhwangsan) — fuming sulfuric acid
  • Russian: о́леум (óleum) — fuming sulfuric acid