Source : Webster's Revised Unabridged Dictionary (1913)

Ostrogoth \Os"tro*goth\, n. [L. Ostrogothi, pl. See {East}, and
   {Goth}.]
   One of the Eastern Goths. See {Goth}.

Source : WordNet®

Ostrogoth
     n : a member of the eastern group of Goths who created a kingdom
         in northern Italy around 500 AD