trojan - English dictionary definition

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Trojan Of or pertaining to ancient Troy or its inhabitants.
Trojan A native or inhabitant of Troy.
trojan a program that appears desirable but actually contains something harmful; "the contents of a trojan can be a virus or a worm"; "when he downloaded the free game it turned out to be a trojan horse"
Trojan horse Trojan horse Coined by MIT-hacker-turned-NSA-spook Dan Edwards 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]
Trojan Horse a large hollow wooden figure of a horse filled with Greek soldiers left by the Greeks outside Troy during the Trojan War
Trojan War Greek mythology a great war fought between Greece and Troy; the Greeks sailed to Troy to recover Helen of Troy, the beautiful wife of Menelaus who had been abducted by Paris; after ten years the Greeks via the Trojan Horse achieved final victory and burned Troy to the ground; "the story of the Trojan War is told in Homer''s Iliad"