Source : Webster's Revised Unabridged Dictionary (1913)

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.

   {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 ({C. Siliquastrum}). {C. Canadensis} and {C.
      occidentalis} are the American species, and are called
      also {redbud}.

Source : WordNet®

Judas tree
     n : small tree of the eastern Mediterranean having abundant
         purplish-red flowers growing on old wood directly from
         stems and appearing before the leaves: widely cultivated
         in mild regions; wood valuable for veneers [syn: {love
         tree}, {Circis siliquastrum}]