the South Slavic language used in the 9th-cent. Bible translation by Saint Cyril and his brother, Saint Methodius, and still used as a liturgical language (now called Church Slavonic) by Orthodox Slavs but extinct as a vernacular
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Old Church Slavonic. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/old-church-slavonic
Old Church Slavonic
The medieval Slavic language used in the translation of the Bible by Cyril and Methodius and in early literary manuscripts and from which the various forms of Church Slavonic developed. Also called Old Bulgarian .