Definition of Trojan horse
1
: someone or something intended to defeat or subvert from within usually by deceptive means
2
: a seemingly useful computer program that contains concealed instructions which when activated perform an illicit or malicious action (such as destroying data files)
also
: the concealed instructions of such a program — compare virus sense 3
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Merriam-Webster unabridged
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Time Traveler for Trojan horse
The first known use of Trojan horse was in 1837
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