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A large new house, usually constructed as part of a suburban development and characterized by ostentation rather than quality of workmanship or architectural distinction.
[Mc(Donald's), trademark of a fast-food restaurant chain (from its mass-produced nature) + mansion.]
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.
(Architecture) informal derogatory a large modern house considered to look mass-produced, lacking in distinguishing characteristics, and at variance with established local architecture
[C20: a corruption of McDonald's, a major American fast-food enterprise noted for the ubiquity of its restaurants]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014