Lewis & Short

Sĕmīrămis (Sămērămis, in good MSS. and Schol., Juv. 2, 108), is or ĭdis, f., = Σεμίραμις, the celebrated queen of Assyria, consort and successor of Ninus, Just. 1, 1, 9; Curt. 5, 1, 24; Ov. M. 4, 58; Juv. 2, 108.
Acc. Semiramin, Curt. 7, 6, 20; Amm. 28, 4, 9.
Abl. Semirami, Just. 36, 2, 1: Semiramide, id. 1, 1, 10.
So Cicero sarcastically calls the profligate A. Gabinius, Cic. Prov. Cons. 4, 9.
Hence, Sĕmīrămĭus, a, um, adj., of or belonging to Semiramis, Semiramian: Semiramio sanguine cretus Polydaemon, Ov. M. 5, 85: acus, i.e. Babylonian, Mart. 8, 28, 18; so, turres, Claud. Cons. Prob. et Olybr. 162.