S / Septizōnĭum
noun

Septizōnĭum

gen. Septizōnii · gender neuter · decl. 2nd
(), , septem-zona.
A large building in Rome in the twelfth region
A large building in Rome in the twelfth region, prob. seven stories in height, Suet. Tit. 2 init.
A monument of the emperor Septimius Severus; in the tenth region
A monument of the emperor Septimius Severus, in the tenth region, Spart. Sev. 19; 35.—
A building of M. Aurelius Antoninus
A building of M. Aurelius Antoninus, Amm. 15, 7, 3 (others consider II. and III. to have been the same building).—
The seven planets
The seven planets, Commod. 7 and 19.