<p><strong>Noun</strong></p><ul><li>Also called Judas Iscariot: the disciple who betrayed Jesus in the New Testament</li><li>a person treacherous enough to betray a friend; traitor</li><li>Also called Saint Judas, one of the 12 apostles of Jesus (not Judas Iscariot)</li><li>(in the Bible) a brother of James (and possibly of Jesus)</li><li>Usually judas</li><li>Also called judas hole: a peephole, as in an entrance door or the door of a prison cell</li></ul><p><strong>Adjective</strong></p><ul><li>(of an animal) used as a decoy to lead other animals to slaughter: A Judas goat led sheep into the abattoir.</li></ul>