Webster’s Revised Unabridged Dictionary · 1913
Slavonian
Sla·vo′ni·an, Sla·von′ic, a. 1. Of or pertaining to Slavonia, or its inhabitants.
2. Of or pertaining to the Slavs, or their language.
Sla·vo′ni·an, n. A native or inhabitant of Slavonia; ethnologically, a Slav.