Sējus or Sēius, i, m.,
I a Roman name , Varr. R. R. 3, 2, 7; 3, 2, 11 sq.; Cic. Planc. 5, 12; id. Off. 2, 17, 58; Tac. A. 2, 20; 4, 1; 6, 7 al.—Hence,
II Sējānus , a, um, adj., of or belonging to Sejus , Sejan : aedes, Varr. R. R. 3, 2, 7 fin. : pastiones, id. ib. 3, 2, 7, § 12: equus, the horse of a certain Cn. Sejus , that brought misfortune to him and to all subsequent possessors: hinc proverbium de hominibus calamitosis ortum dicique solitum: ille homo habet equum Sejanum, Gell. 3, 9, 6.—
B Subst.: L. Aelius Sejanus, son of Sejus Strabo , the powerful praefectus praetorii of Tiberius , Tac. A. 4, 1 sq.; Tib. 55 sq.
IV —Hence, Sējānĭānus , a, um, adj., of or pertaining to L. Aelius Sejanus : satellites, Sen. Cons. ad Marc. 1, 2: Sejanianum jugum, id. ib. 1, 3.