(Αἴθουσα), a daughter of Poseidon and Alcyone, who was beloved by Apollo, and bore to him Eleuther. (Apollod. 3.10.1 ; Paus. 9.20 § 2.)
[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