Mŏnoecus, i, m., = Μόνοικος (that dwells alone),
a surname of Hercules; hence, Arx Monoeci, a promontory and harbor in Liguria , the mod. Monaco : portus Herculis Monoeci, Plin. 3, 5, 7, § 47; Tac. H. 3, 42: Arx Monoeci, Verg. A. 6, 830; Luc. 1, 408; Amm. 15, 10, 9.—Called also: Saxa Monoeci, Sil. 1, 586.