Poetical, pertaining to the Muses. The Muses, according to Grecian mythology, dwelt in Aonia, that part of Boetia which contains Mount Helicon and the Muses' Fountain. Thomson calls the fraternity of poets
The Aonian hive Who praised are, and starve right merrily.
Castle of Indolence , ii. 2.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894