(1):

(n.) One who shows the pluck, endurance, determined energy, or the like, attributed to the defenders of Troy; - used chiefly or only in the phrase like a Trojan; as, he endured the pain like a Trojan; he studies like a Trojan.

(2):

(a.) Of or pertaining to ancient Troy or its inhabitants.

(3):

(n.) A native or inhabitant of Troy.