Lewis Short
Acis (noun F) :
* One of the Cyclades, i. q. Siphnus, Plin. 4, § 66.
Charlton T. Lewis, Charles Short, A Latin Dictionary
Lewis Short
Ācis (noun M) : Ἆκις
* A river in Sicily, which rises in Mount Aetna, and falls into the sea; now Fiume di Taci, Ov. F. 4, 468; Sil. 14, 221; Claud. Rapt. Pros. 3, 332 al.—Hence
* A river-god, acc. to the myth, son of Faunus, beloved by Galatea on account of his beauty, Ov. M. 13, 750 sq.
Charlton T. Lewis, Charles Short, A Latin Dictionary