Ocnus or -os, = Ὄκνος (sloth).
I The founder of the city of Mantua , Verg. A. 10, 198.—
II An allegorical picture of Socrales the painter , which represented a man twisting a rope , while an ass kept gnawing it apart , Plin. 35, 11, 40, § 137.—Hence, prov., of labor in vain, which never comes to an end, Prop. 4, 3, 21.