Lewis Short
(verb) : ŏperto, āre, id.
* To cover (ante-class.): opertat saepe opertit,Fest. p. 191 Müll.; Enn. ap. Non. 223, 30 (Ann. v. 500 Vahl.): continuo operta denuo,Plaut. Trin. 3, 3, 75 Fleck. (Ritschl, operi).
Charlton T. Lewis, Charles Short, A Latin Dictionary