ōrātus, ūs (only in abl. sing. and plur.), m. [oro],
a praying , entreating; a request , entreaty (very rare but class.): oratu tuo, Cic. Fl. 37, 92: illarum oratu, Plaut. Cas. 2, 2, 17; Sid. Ep. 9, 14 init. : magnis oratibus, Coripp. Laud. Just. 2, 4.
oratus , ūs m oro, a praying, request, entreaty ; only abl sing. : oratu tuo. ...
An Elementary Latin Dictionary