[Old Church Slavonic] n (ca. 1929): the Slavic language used in the liturgical and Biblical translations of Cyril and Methodius as attested in manuscripts of the 10th and 11th centuries--called also Old Church Slavic
OLD CHURCH SLAVONIC
Meaning of OLD CHURCH SLAVONIC in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012