Lewis Short
(adjective) : Mopsŏpĭus, a, um, , = Μοψόπιος
* Of or belonging to Mopsopia (Μοψοπία, an old name of Attica), Mopsopian, Attic, Athenian (only poet.): Mopsopius juvenis,i. e. Triptolemus,Ov. M. 5, 661: muri,i. e. of Athens,id. ib. 6, 423: urbs,Athens,id. H. 8, 72.—As subst.: Mopsŏpĭa, ae, f.: Mopsopia tota, i. e. all Athens or all Attica, Sen. Hippol. 121; 1276.
Charlton T. Lewis, Charles Short, A Latin Dictionary