oil paintingn.1. A painting done in oil paints.2. The art or practice of painting with oils.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.oil painting n 1. (Art Terms) a picture painted with oil paints 2. (Art Terms) the art or process of painting with oil paints 3. he’s no oil painting informal he is not good-looking Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014oil? paint`ing n. 1. the art or technique of painting with oil colors. 2. a painting executed in oil colors. [1775?85] oil? paint`er, n. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.