Usually means: Concentrated sulfuric acid with SO3.
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We found 13 dictionaries that define the word oleum:

General (10 matching dictionaries)
  1. oleum: Merriam-Webster
  2. oleum: Oxford Learner's Dictionaries
  3. oleum: American Heritage Dictionary of the English Language
  4. oleum: Collins English Dictionary
  5. Oleum, oleum: Wordnik
  6. oleum: Wiktionary
  7. oleum: Infoplease Dictionary
  8. oleum: Dictionary.com
  9. Oleum: Wikipedia, the Free Encyclopedia
  10. oleum: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. oleum: Encyclopedia

Medicine (2 matching dictionaries)
  1. oleum: Merriam-Webster Medical Dictionary
  2. oleum: Medical dictionary

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Definitions from Wiktionary (oleum)

▸ noun:  (inorganic chemistry) A solution of sulfur trioxide in sulfuric acid.

Similar:
sulfur trioxide, oleyl, sulphur trioxide, sulfur monoxide, sulphuricum, sulfur oxide, olein, fuming sulfuric acid, oleochemical, sulphur oxide, more...

Opposite:
water, aqua, H2O

Phrases:
oleum amygdalae, oleum dulci vitrioli, more...

Adjectives:
rust, valve, strong, weak, latin, much, yellow, concentrated, dilute, sulfuric

▸ Words similar to oleum

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Similar:
sulfur trioxide, oleyl, sulphur trioxide, sulfur monoxide, sulphuricum, sulfur oxide, olein, fuming sulfuric acid, oleochemical, sulphur oxide, more...

Opposite:
water, aqua, H2O

Phrases:
oleum amygdalae, oleum dulci vitrioli, more...

Adjectives:
rust, valve, strong, weak, latin, much, yellow, concentrated, dilute, sulfuric



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