LSJ

Μα^κεδον-ίζω ,
A. to be on the Macedonian side, Plb.20.5.5, Plu.Alex. 30, etc.: speak Macedonian, Id.Ant.27, Ath.3.122a:—hence Adv. Μα^κεδον-ιστί , in Macedonian, Plu.Eum.14.


http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.04.0057:entry%3D*makedoni/zw