trad·i·tor \ˈtradəd.ə(r)\noun (pluraltradito·res \ˌtradəˈtōr(ˌ)ēz\) Etymology: Middle English traditour traitor, from Latin traditor — more at traitor 1.obsolete: traitor 2.: one of the Christians giving up to the officers of the law the Scriptures, the sacred vessels, or the names of their brethren during the Roman persecutions