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rootkit

[ root-kit, root‐ ]
/ ˈrutˌkɪt, ˈrʊt‐ /
Computers.
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noun
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 or without object), root·kit·ted, root·kit·ting.
to install such software on (a computer, electronic device, etc.): I think my system has been rootkitted.
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Origin of rootkit

First recorded in 1990–95; 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. 2022

British Dictionary definitions for rootkit

rootkit
/ (ˈruːtˌkɪt) /

noun
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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