(Ἄκις), according t Ovid (Ov. Met. 13.750, &c.) a son of Faunus and Symaethis. He was beloved by the nymph Galatea, and Polyphemus the Cyclop, jealous of him, crushed him under a huge rock. His blood gushing forth from under the rock was changed by the nymph into the river Acis or Acinius at the foot of mount Aetna. This story does not occur any where else, and is perhaps no more than a happy fiction suggested by the manner in which the little river springs forth from under a rock.
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890