responsory

n.; pl. -ries [ LL. responsorium. ] 1. (Eccl.) (a) The answer of the people to the priest in alternate speaking, in church service. (b) A versicle sung in answer to the priest, or as a refrain. [ 1913 Webster ]

Which, if should repeat again, would turn my answers into responsories, and beget another liturgy. Milton. [ 1913 Webster ]

2. (Eccl.) An antiphonary; a response book. [ 1913 Webster ]