Source : Webster's Revised Unabridged Dictionary (1913)

Barberry \Bar"ber*ry\, n. [OE. barbarin, barbere, OF. berbere.]
   (Bot.)
   A shrub of the genus {Berberis}, common along roadsides and
   in neglected fields. {B. vulgaris} is the species best known;
   its oblong red berries are made into a preserve or sauce, and
   have been deemed efficacious in fluxes and fevers. The bark
   dyes a fine yellow, esp. the bark of the root. [Also spelt
   {berberry}.]

Source : WordNet®

barberry
     n : any of numerous plants of the genus Berberis having prickly
         stems and yellow flowers followed by small red berries