Antiphonary

An Antiphonary, Antiphonal, "Antiphony" or Antiphoner (Latin antiphonarium, antiphonarius, antiphonarius liber, antiphonale; Greek ’antíphonon, antiphon, antiphone, anthem) is one of the liturgical books intended for use in choro (i. e. in the liturgical choir), and originally characterized, as its name implies, by the assignment to it principally of the antiphons used in various parts of the Roman liturgy.