Source : Webster's Revised Unabridged Dictionary (1913)

Redbud \Red"bud`\ (-b?d`), n. (Bot.)
   A small ornamental leguminous tree of the American species of
   the genus {Cercis}. See {Judas tree}, under {Judas}.

Source : WordNet®

redbud
     n : small shrubby tree of eastern North America similar to the
         Judas tree having usually pink flowers; found in damp
         sheltered underwood [syn: {Cercis canadenis}]