The Collaborative International Dictionary
Judas \Ju"das\, n. The disciple who betrayed Christ. Hence: A treacherous person; one who betrays under the semblance of friendship. -- a. Treacherous; betraying. Judas hole, a peephole or secret opening for spying. Judas kiss,
a deceitful and treacherous kiss.
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an act appearing to be an act of friendship, which is in fact harmful to the recipient.
Judas tree (Bot.), a leguminous tree of the genus Cercis, with pretty, rose-colored flowers in clusters along the branches. Judas is said to have hanged himself on a tree of this genus ( Cercis Siliquastrum). Cercis Canadensis and Cercis occidentalis are the American species, and are called also redbud.
Usage examples of "judas hole".
Roarke knocked, then stepped to the side so Brian was in view of the Judas hole.
Presently there was a slight metallic sound from the door and I knew someone was watching through the Judas hole.