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oleum

[oh-lee-uh m]
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noun, plural o·le·a [oh-lee-uh] /ˈoʊ li ə/ for 1, o·le·ums for 2.
  1. Pharmacology. oil.
  2. Chemistry. pyrosulfuric acid.
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Origin of oleum

1900–05; < Latin: oil
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for oleum

oleum

noun plural olea (ˈəʊlɪə) or oleums
  1. another name for fuming sulphuric acid
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012