trad·i·tor (trād'ĭ-tər) n.
pl.trad·i·to·res (-tôr'ēz, -tōr'-) One of the early Christians who betrayed fellow Christians during the Roman persecutions.
[Middle English traditour, betrayer, from Latin trāditor, from trāditus, past participle of trādere, to betray, hand over; see tradition.]