aonian

from The Century Dictionary.

• Pertaining to Aonia, an ancient mythological and poetical name of Bœotia, or to the Muses, who were supposed to dwell there; hence, pertaining to the Muses; poetical.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Pertaining to Aonia, in Bœotia, or to the Muses, who were supposed to dwell there.
• adjective the fountain of Aganippe, at the foot of Mount Helicon, not far from Thebes, and sacred to the Muses.