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rootkit

[root-kit, roo t‐] /ˈrutˌkɪt, ˈrʊt‐/
noun
1.
malicious software that allows an unauthorized user to maintain access to a computer by concealing programs and processes, files, or data from the operating system.
verb (used with object), verb (used without object), rootkitted, rootkitting.
2.
to install such software on (a computer, electronic device, etc.):
I think my system has been rootkitted.
Origin
root1 (conventional name for the username or account of a UNIX administrator) + kit1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for root-kitting

rootkit

/ˈruːtˌkɪt/
noun
1.
(computing) a set of programs used to gain unauthorized access to a computer's operating system, esp in order to destroy or alter files, attack other computers, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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