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A man's evening jacket, often made of a fine fabric, elaborately trimmed, and usually worn at home.
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.
(Clothing & Fashion) a man's comfortable jacket of velvet, etc, closed by a tie belt or fastenings, worn at home
[so called because it was formerly worn for smoking]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a loose-fitting jacket for men, often of a heavy fabric and trimmed with braid, worn indoors, esp. for lounging.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.