S / Siphnus
noun

Siphnus

gen. Siphni · gender feminine · decl. 2nd
one of the Cyclades; Sifano; Siphnian
one of the Cyclades, now Sifano, Mel. 2, 7; Plin. 4, 12, 22, § 66; 36, 22, 44, § 159.—Hence, Siphnĭus, a, um, adj., Siphnian: lapis, Plin. 36, 22, 44, § 159.