Ionic Greek

Short definition from Wiktionary

Proper noun

1. 1
   The dialect of Ancient Greek used on Euboea and other islands in the Aegean Sea and in parts of Asia Minor, from around 1000 to 300 B.C.E., closely related to Attic Greek and contributing a great deal to Epic Greek. The language of Herodotus, Hippocrates, and Archilochus.