What does Ostōrius mean in Latin?

Ostōrius, a proper noun, means “a Roman nomen gentile, gens or "family name" famously held by”.

What is the genitive of Ostōrius?

The genitive singular is Ostōriī. Ostōrius is masculine, second declension.

In classical Latin, [ɔsˈtoː.ri.ʊs]; in ecclesiastical (church) Latin, [osˈtɔː.ri.us].

proper noun · masculinesecond declension

Ostōrius m sg (genitive Ostōriī or Ostōrī)

Classical[ɔsˈtoː.ri.ʊs]Ecclesiastical[osˈtɔː.ri.us]

Ostōrĭus, i, m.,

I. the name of several Romans.

I. Ostorins Sabinus, a Roman knight, Tac. A. 16, 23; 16, 30: quaestor, id. ib. 16, 33.—

II. P. Ostorius Scapula, proprœtor in Britain, Tac. A. 12, 31: bello egregius, id. Agr. 14.—

III. M. Ostorius Scapula, son of Publius, Tac. A. 12, 31; put to death by Nero, id. ib. 16. 15.