Ācis, ĭdis, m., = Ἆκις,
I 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,
II A river-god , acc. to the myth, son of Faunus , beloved by Galatea on account of his beauty , Ov. M. 13, 750 sq.