Source : Webster's Revised Unabridged Dictionary (1913)

Sudra \Su"dra\, n. [Skr. [,c]?dra.]
   The lowest of the four great castes among the Hindoos. See
   {Caste}. [Written also {Soorah}, {Soodra}, and {Sooder}.]

Source : WordNet®

Sudra
     n 1: a member of the lowest or worker Hindu caste [syn: {Shudra}]
     2: the lowest of the four varnas: the servants and workers of
        low status [syn: {shudra}]