- a combining form meaning “oil,” used in the formation of compound words: oleograph.
Also especially before a vowel, ole-.
Origin of oleo-
< Latin, combining form representing oleum oil
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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.)).
Online Etymology Dictionary, © 2010 Douglas Harper
- Oil:oleic acid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.