(Ἰθώματας), a surname of Zeus derived from the Messenian hill of Ithome, where the god had a sanctuary, and where an annual festival, the Ithomaea, was celebrated in his honour. (Paus. 4.33.2, &c.)
[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