Lewis Short
(adj.adv.) : per-dĭsertus, a, um, adj.
* Very eloquent (late Lat. and rare), Gram. Vat. Praep. 5 (Class. Auct. vol. 5 Mai).—Hence, per-dĭsertē, adv., very eloquently, Cic. de Or. 1, 14, 62.
Charlton T. Lewis, Charles Short, A Latin Dictionary