SLAVONIC Meaning of SLAVONIC in English [Sla.von.ic] adj [NL slavonicus, fr. ML Sclavonia, Slavonia, the Slavic-speaking countries, fr. Sclavus Slav] (ca. 1645): slavic [2]Slavonic n (1668) 1: slavic 2: old church slavonic Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012