Lewis & Short

Ostrŏgŏthus, i, or Ostrŏgŏtha, ae, m., an Ostrogoth: Ostrogothum continere, Sid. Carm. 2, 377; id. Ep. 8, 9: imperium Ostrogothae vastarent, Jornand. Reb. Get. 47; Claud. in Eutr. 2, 153.