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oleum

[oh-lee-uh m] /ˈoʊ li əm/
noun, plural olea
[oh-lee-uh] /ˈoʊ li ə/ (Show IPA),
for 1, oleums for 2.
1.
Pharmacology, oil.
2.
Chemistry, pyrosulfuric acid.
Origin of oleum
1900-1905
1900-05; < Latin: oil
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for oleum

oleum

/ˈəʊlɪəm/
noun (pl) olea (ˈəʊlɪə), oleums
1.
another name for fuming sulphuric acid
Word Origin
from Latin: oil, referring to its oily consistency
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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7
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