trojan horse meaning and definition

TROJAN HORSE noun

Definition of Trojan horse (noun)

1. a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst
   • synonyms: fifth column
2. 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"
   • synonyms: trojan
3. a large hollow wooden figure of a horse (filled with Greek soldiers) left by the Greeks outside Troy during the Trojan War
   • synonyms: Wooden Horse