antiphonal

/AE1 N T AH0 F AA0 N AH0 L/
noun
  1. 1

    A book of antiphons or anthems sung or chanted at a liturgy; an antiphonary or antiphoner.

  2. 2

    An antiphon; a piece sung or chanted in an antiphonal manner.

adjective
  1. 1

    Characterized by antiphones or antiphony; incorporating alternate, or responsive singing by a choir split into two parts.

    โ€œThe antiphonal hymn was sung regularly at church.โ€

Source: https://en.wiktionary.org/wiki/antiphonal