undergoing or resulting from mutation.
a new type of organism produced as the result of mutation.

1900–05; < Latin mūtant- (stem of mūtāns), present participle of mūtāre to change; see -ant

unmutant, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mutant (ˈmjuːtənt)
1.  Also called: mutation an animal, organism, or gene that has undergone mutation
2.  of, relating to, undergoing, or resulting from change or mutation
[C20: from Latin mutāre to change]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1901, in the biological sense, from L. mutantem (nom. mutans) "changing," prp. of mutare "to change" (see mutable). In the science fiction sense, it is attested from 1954.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mutant mu·tant (myōōt'nt)
An organism possessing one or more genes that have undergone mutation. adj.
Resulting from or undergoing mutation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

mutant definition

Microsoft's term for a mutex which is generally used in user mode but can also be used in kernel mode. According to this terminology a mutex is only used in kernel mode.
["Microsoft Windows NT Workstation Resource Kit"].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
It's not unusual for plants to produce mutant fruit that lacks seeds, but these
  fruits are usually the end of their line.
By the time a gargantuan mutant rat starts attacking people, it may already be
  too late for them to stop it.
Futurama's crew includes an alien, a mutant, and a robot.
All it takes is a few mutant microbes to cause trouble.
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