Lewis Short
(adjective) : Firmĭus, ii, m.
* A Roman proper name, e. g. Firmius Catus, Tac. A. 2, 27; 4, 31.— Hence, Firmĭānus, a, um, , of Firmius, an unknown silver-worker of that name: Firmiana vasa,Plin. 33, 11, 49, § 139 (Jan. Furniana).
Charlton T. Lewis, Charles Short, A Latin Dictionary