oleum
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o·le·um
(ō′lē-əm)n. pl. o·le·a (ō′lē-ə) or o·le·ums
A corrosive fuming solution of sulfur trioxide in sulfuric acid.
[Latin, olive oil; see oil.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
oleum
(ˈəʊlɪəm)n, pl olea (ˈəʊlɪə) or oleums
(Elements & Compounds) another name for fuming sulphuric acid
[from Latin: oil, referring to its oily consistency]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014