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oleo-

  1. a combining form meaning “oil,” used in the formation of compound words: oleograph.
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Also especially before a vowel, ole-.

Origin of oleo-

< Latin, combining form representing oleum oil
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for oleo-

oleo-

combining form
  1. oiloleomargarine
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Word Origin

from Latin oleum oil
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

Word Origin and History for oleo-

word-forming element meaning "oil" or "oleic," from Latin oleum (see oil (n.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

oleo- in Medicine

oleo-

pref.
  1. Oil:oleic acid.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.