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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.
a mirror, esp a ladies' dressing mirror
with normal or familiar circumstances reversed; topsy-turvy: a looking-glass world.
[sense 2 in allusion to Lewis Carroll's Through the Looking-Glass]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a mirror.
2. the glass used in a mirror.
having the normal elements or circumstances reversed; topsy-turvy: a looking-glass world.
[alluding to the reversed world in Lewis Carroll's Through the Looking Glass (1871)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.