oleum

oleum (singular), olea (plural) A solution of sulfur trioxide in sulfuric acid.
Found on http://www.wordinfo.info/words/index/info/view_unit/1457/3

oleum

oleum: see sulfuric acid.
Found on http://www.infoplease.com/ce6/sci/A0916991.html

Oleum

Oleum (Latin oleum = `oil`), or fuming sulfuric acid, is a solution of various compositions of sulfur trioxide in sulfuric acid, or sometimes more specifically to disulfuric acid (also known as pyrosulfuric acid). Oleums can be described by the formula ySO3.H2O where y is the total molar sulfur trioxide content. The value of y can be varied, to ..
Found on http://en.wikipedia.org/wiki/Oleum
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