oleum

[oh-lee-uhm]
noun, plural olea [oh-lee-uh] , for 1, oleums for 2.
1.
Pharmacology, oil.
2.
Chemistry, pyrosulfuric acid.

Origin:
1900–05; < Latin: oil

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World English Dictionary
oleum (ˈəʊlɪəm)
 
n , pl olea, oleums
another name for fuming sulphuric acid
 
[from Latin: oil, referring to its oily consistency]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Oleum is a concentrated solution of sulfuric acid and sulfur trioxide.
Over time, the oleum had corroded piping in the plant's spent acid recovery unit.
Exposure to sulfuric acid and oleum can also occur through accidental releases.
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