trojan

(noun) a native of ancient Troy. Synonyms: Trojan, Dardan, Dardanian.

(noun) a program that appears desirable but actually contains something harmful. Synonyms: trojan horse. Examples: "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."

(adj) of or relating to the ancient city of Troy or its inhabitants. Synonyms: Trojan. Example: "Trojan cities."