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rootkit

[root-kit, roo t‐]Computers.
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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.
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verb (used with or without object), root·kit·ted, root·kit·ting.
  1. to install such software on (a computer, electronic device, etc.): I think my system has been rootkitted.
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Origin of rootkit

root1 (conventional name for the username or account of a UNIX administrator) + kit1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for rootkit

rootkit

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
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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