Lewis Short
(adjective) : dŭcĭānus, a, um, dux
* Of or belonging to a leader or commander (late Lat.): officium, Cod. Th. 15, 11, 2: apparitores,ib. 11, 25, 1: judicium,Cod. Just. 7, 62, 38.—Subst.: ducianus, i, m., a commander's servant, Cod. Th. 7, 16, 3; Cod. Just. 1, 27, 2, § 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary