Trojan

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A native or inhabitant of ancient Troy.
2. n. A person of courageous determination or energy.
3. adj. Of or relating to a celestial body, especially an asteroid, that is in one of the Lagrangian points of a two-body system. Used especially of any of a group of asteroids that orbit at Jupiter's distance from the sun, but 60° ahead of or behind the planet.

Century Dictionary and Cyclopedia

1. Of or relating to ancient Troy, a celebrated city in Mysia, Asia Minor.
2. n. An inhabitant of Troy.
3. n. A plucky or determined fellow; one who fights or works with a will.
4. n. A boon companion; an irregular liver: sometimes used loosely as a term of opprobrium.
5. n. plural In entomology, a name given by Linnæus to certain butterflies, mostly tropical and now generally included in the genus Papilio, characterized by their velvety-black colors with crimson spots on the wings and breast. Allied species of different colors were called Greeks, and both together formed the group Fquites. It is now known that certain “Trojans” are sexual varieties of the “Greeks,” but the names are still occasionally used.

Wiktionary

1. n. A native or inhabitant of the ancient city of Troy.
2. n. A student (especially an athlete) of the University of Southern California.
3. n. astrophysics A Trojan asteroid.
4. n. astrophysics An object residing at a Trojan point.
5. n. programming A very widespread and popular form of malware or computer virus.
6. adj. Of, or relating to, the famed city of Troy or its inhabitants.
7. adj. astrophysics Of, or relating to, a Trojan point.
8. adj. programming Of, or relating to, a certain type of malware.

GNU Webster's 1913

1. adj. Of or pertaining to ancient Troy or its inhabitants.
2. adj. One who shows the pluck, endurance, determined energy, strength, or the like, attributed to the defenders of Troy; -- used chiefly or only in the phrase like a Trojan.

WordNet 3.0

1. n. a native of ancient Troy
2. n. a program that appears desirable but actually contains something harmful
3. adj. of or relating to the ancient city of Troy or its inhabitants