- noting or written in an alphabet, probably invented by St. Cyril in about a.d. 865, formerly used in writing Old Church Slavonic and other Slavic languages: almost completely replaced by Cyrillic starting about the 10th century.
- the Glagolitic alphabet.
- of, relating to, or denoting a Slavic alphabet whose invention is attributed to Saint Cyril, preserved only in certain Roman Catholic liturgical books found in Dalmatia
