Lewis Short
ōrātus (noun M) : (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.
Charlton T. Lewis, Charles Short, A Latin Dictionary