Judas one of the twelve Apostles; full name Judas Iscariot, who betrayed Christ to the Jewish authorities in return for thirty pieces of silver; the Gospels leave his motives uncertain. Overcome with remorse, he later committed suicide by hanging, and was buried in the potter's field.
Judas Bible an early 17th century translation in which Judas appears as a misprint for Jesus.
Judas-coloured of hair, red, from the medieval tradition that Judas Iscariot had red hair and beard.
Judas goat an animal used to lead others in a flock or herd to destruction, as in a slaughterhouse.
Judas kiss an act of betrayal, especially one disguised as a gesture of friendship, with biblical allusion to the betrayal of Christ, when in Gethsemane Judas identified their quarry to the soldiers with a kiss of greeting.
Judas tree a Mediterranean tree of the pea family, with purple flowers that typically appear before the rounded leaves; according to popular belief, Judas hanged himself on a tree of this kind.
Judas window a small aperture in a door (in some old houses, or in prison cells), through which a person can look without being noticed from the other side; a peep-hole.

Judas Iscariot (d. c.ad 30) Disciple who betrayed Jesus Christ to the Jewish hierarchy. In the New Testament, he was named as one of the 12 apostles originally chosen by Jesus, and served as the group's treasurer. In return for 30 pieces of silver, Judas agreed to assist the chief priests in arresting Jesus.

ju·das / ˈjoōdəs/ (also judas hole) • n. a peephole in a door.

Judas Iscariot. The disciple who betrayed Jesus to the Jewish authorities (Mark 14. 10 f., 43 ff.; John 18. 2 ff., etc.).

judas opening through which one can look without being seen. XIX. — F. judas, transf. use of the name of the disciple who betrayed Jesus Christ (Matt. 26: 48).