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No longer living but supernaturally animated, as a zombie.
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.
(European Myth & Legend)
a. (of a fictional being, such as a vampire) technically dead but reanimated
b. (as collective noun; preceded by the): the undead.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. no longer alive but animated by a supernatural force, as a vampire or zombie.n.
2. (used with a pl. v.) undead beings collectively (usu. prec. by the).
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.