easternmost part of the kingdom of the Merovingian Franks from the 6th to the 8th cent., composed of what is now NE France, Belgium, and W Germany
Origin:
ML < OHG ostarrih: see Austria
See Austrasia in American Heritage Dictionary 4
The eastern portion of the kingdom of the Franks from the sixth to the eighth century, including parts of eastern France, western Germany, and the Netherlands. It eventually became part of the Carolingian empire.