Judas hole, a peephole or secret opening for spying. -- Judas kiss, (a) a deceitful and treacherous kiss. (b) 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.

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OXFORD DICTIONARY

judas, n.
1 a person who betrays a friend.
2 (judas) a peep-hole in a door.

Idiom

Judas-tree a Mediterranean tree, Cercis siliquastrum, with purple flowers usu. appearing before the leaves.

Etymology

Judas Iscariot who betrayed Christ (Luke 22)

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THESAURUS

judas

Benedict Arnold, Brutus, Judas Iscariot, Quisling, archtraitor, betrayer, cockatrice, conniver, conspirator, conspirer, convict, criminal, crook, deceiver, desperado, desperate criminal, double agent, double-crosser, double-dealer, felon, fugitive, gallows bird, gangster, gaolbird, informer, intrigant, intriguer, jailbird, lawbreaker, machinator, mobster, outlaw, plotter, public enemy, quisling, racketeer, rat, schemer, scofflaw, serpent, snake, swindler, thief, thug, timeserver, traitor, treasonist, trimmer, turncoat, two-timer

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ROGET THESAURUS

judas

Knave

N knave, rogue, Scapin, rascal, Lazarillo de Tormes, bad man, blackguard, barrater, barrator, shyster, traitor, betrayer, archtraitor, conspirator, Judas, Catiline, reptile, serpent, snake in the grass, wolf in sheep's clothing, sneak, Jerry Sneak, squealer, tell-tale, mischief-maker, trimmer, fence-sitter, renegade, truant, recreant, sycophant.

Deceiver

N deceiver &c (deceive), dissembler, hypocrite, sophist, Pharisee, Jesuit, Mawworm, Pecksniff, Joseph Surface, Tartufe, Janus, serpent, snake in the grass, cockatrice, Judas, wolf in sheep's clothing, jilt, shuffler, stool pigeon, liar &c (lie), story-teller, perjurer, false witness, menteur a triple etage, Scapin, bunko steerer, carpetbagger, capper, faker, fraud, four flusher, horse coper, ringer, spieler, straw bidder, imposter, pretender, soi-disant, humbug, adventurer, Cagliostro, Fernam Mendez Pinto, ass in lion's skin, actor, quack, charlatan, mountebank, saltimbanco, saltimbanque, empiric, quacksalver, medicaster, Rosicrucian, gypsy, man of straw, conjuror, juggler, trickster, prestidigitator, jockey, crimp, decoy, decoy duck, rogue, knave, cheat, swindler, jobber, saint abroad and a devil at home.

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