Lewis Short
(adjective) : Thĕŏpompos, i, m., = Θεόπομπος
* A Greek historian and orator, a pupil of Isocrates, Cic. de Or. 2, 13, 57; 2, 23, 94; 3, 9, 36; Nep. Alcib. 11, 1. — Hence, Thĕŏ-pompēus or -īnus, a, um, , of or belonging to Theopompus, Theopompean: Theopompino genere (dicendi),Cic. Att. 2, 6, 2: Theopompeo more,id. Or. 61, 207.
Charlton T. Lewis, Charles Short, A Latin Dictionary