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Trojan horse

noun
1.
Classical Mythology. a gigantic hollow wooden horse, left by the Greeks upon their pretended abandonment of the siege of Troy. The Trojans took it into Troy and Greek soldiers concealed in the horse opened the gates to the Greek army at night and conquered the city.
2.
a person or thing intended to undermine or destroy from within.
3.
a nonreplicating computer program planted illegally in another program to do damage locally when the software is activated.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Trojan horse

Trojan Horse

noun
1.
(Greek myth) Also called the Wooden Horse. the huge wooden hollow figure of a horse left outside Troy by the Greeks when they feigned retreat and dragged inside by the Trojans. The men concealed inside it opened the city to the final Greek assault
2.
a trap intended to undermine an enemy
3.
(computing) a bug inserted into a program or system designed to be activated after a certain time or a certain number of operations
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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Trojan horse in Culture

Trojan Horse definition


In classical mythology, a large, hollow horse made of wood used by the Greeks to win the Trojan War. The resourceful Odysseus had come up with the plan for the horse. The Greeks hid soldiers inside it and left it outside the gates of Troy. They anchored their ships just out of sight of Troy and left a man behind to say that the goddess Athena would be pleased if the Trojans brought the horse inside the city and honored it. The Trojans took the bait, against the advice of Cassandra and Laocoon. That night the Greek army returned to Troy. The men inside the horse emerged and opened the city gates for their companions. The Greeks sacked the city, thus winning the war.

Note: The story of the Trojan horse is the source of the saying “Beware of Greeks bearing gifts.”
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang definitions & phrases for Trojan horse

triple whammy

noun phrase

A three-part attack, difficulty, threat, etc: Triple Whammy on the Farm (1940s+)


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Trojan horse in Technology
application, security
(Or just "trojan") A term coined by MIT-hacker-turned-NSA-spook Dan Edwards for a malicious, security-breaking program that is disguised as something benign, such as a directory lister, archiver, game or (in one notorious 1990 case on the Mac) a program to find and destroy viruses! A Trojan horse is similar to a back door.
See also RFC 1135, worm, phage, mockingbird.
[Jargon File]
(2008-06-19)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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