defragger
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de·frag
(dĭ-frăg′)tr.v. de·fragged, de·frag·ing, de·frags Informal
To defragment.
de·frag′ger n.
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.
defragger
(diːˈfræɡə)n
a device which defragments computer files
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014