Lewis Short
(adjective) : ĕpistŭlārĭus, a, um, , = epistularis
* Of or belonging to a letter.
* Adj.: scriptio,Ennod. 1, ep. 22.
* Subst.: epīstŭlarĭi, ōrum, m., state secretaries, Salv. Gub. D. 5, 7.
Charlton T. Lewis, Charles Short, A Latin Dictionary