Trojan definition

trōjən
A native or inhabitant of ancient Troy.
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A person of courageous determination or energy.
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A strong, hardworking, determined person.
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A celestial body that is in one of the two stable Lagrangian points of a two-body system, especially an asteroid with solar orbits at Jupiter's distance from the sun, but traveling 60° ahead of or behind the planet.
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Of ancient Troy or its people or culture.
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A person born or living in ancient Troy.
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(obs.) A merry, dissolute companion.
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Trojan means relating to the people, area or culture of ancient Troy.

An example of Trojan used as an adjective is in the phrase "Trojan War," which means the war fought in ancient Troy.

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The definition of a Trojan is a person from ancient Troy, a hardworking individual, or a malicious computer application.

An example of a Trojan is a brave, determined warrior.

An example of a Trojan is a network software application that hides on a computer while it performs attacks on the computer's system.

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Named after the Trojan Horse of ancient Greek history, it is a particular kind of network software application developed to stay hidden on the computer where it has been installed. As with worms, Trojans generally serve malicious purposes and are in the “malware” classification. Trojans sometimes access personal information stored on home or business computers and then send it to a remote party via the Internet. Alternatively, Trojans may serve merely as a back door application. Trojans can also launch DoS attacks. A combination of firewalls and anti-virus software should be used to protect networks against Trojans. New Trojans are released on a frequent basis. For example, on March 3, 2005, security experts at McAfee and SophosLabs issued alerts of a new Trojan virus called Troj/BagleD1-L. This Trojan tries to prevent various security applications (such as anti-virus and firewall software) from working by renaming files belonging to security applications so that they can no longer load. It then attempts to block access to a range of security-related Websites by altering the Windows HOSTS file. The virus is said to arrive on email messages having a ZIP attachment. After it is opened, the ZIP attachment includes a program file named “doc—01.exe” or “prs—03.exe” or some other name. If the program inside the ZIP attachment is opened, the Troj/BagleD1-L attempts to connect to one of many Websites to download more code. About, Inc. Trojan. [Online, 2004.] About, Inc. Website. http://compnet working.about.com/cs/worldwideweb/g/bldef_trojan.htm; In Brief. Security Experts Fear New Trojan on the Loose. The Globe and Mail, March 3, 2005, p. B10.
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(computing) Malware that appears to perform or actually performs a desired task for a user while performing a harmful task without the user's knowledge or consent.
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A native or inhabitant of the ancient city of Troy.
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A student (especially an athlete) of the University of Southern California.
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(astrophysics) A Trojan asteroid.
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(astrophysics) An object residing at a Trojan point.
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(computing) A Trojan horse.
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Of, or relating to, the famed city of Troy or its inhabitants.
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(astrophysics) Of, or relating to, a Trojan point.
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(programming) Of, or relating to, a certain type of malware.
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(astronomy) Describing a satellite (moon or minor planet) that shares an orbit with another.
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Other Word Forms

Noun

Singular:
trojan
Plural:
trojans

Origin of trojan

  • From the official convention of naming such objects after the heroes of the Trojan War, a practice derived from the fact that the first such object to be observed was named after Achilles and the second after Patroclus

    From American Heritage Dictionary of the English Language, 5th Edition

  • Middle English from Latin Trōiānus from Trōia , Troy from Greek Troiā, Trōiā from Trōs the mythical founder of Troy

    From American Heritage Dictionary of the English Language, 5th Edition

  • Trojan horse

    From Wiktionary