The Euchologion (Greek: εὐχολόγιον; Slavonic: Молитвословъ, Molitvoslov ; Romanian: Molitfelnic) is one of the chief liturgical books of the Orthodox Church and Eastern Catholic Churches, containing the portions of the services which are said by the bishop, priest, or deacon (it corresponds more or less to the Roman Catholic Missal, Ritual, and Pontifical combined). There are several different volumes of the book in use.