responsory

Noun

re=spon=so=ry

CIDE DICTIONARY

responsory, a.

Containing or making answer; answering. Johnson. [1913 Webster]

responsory, n. [LL. responsorium.].

The answer of the people to the priest in alternate speaking, in church service. [1913 Webster]
"Which, if should repeat again, would turn my answers into responsories, and beget another liturgy." [1913 Webster]
An antiphonary; a response book. [1913 Webster]

responsory, n. (pl. -ies) an anthem said or sung by a soloist and choir after a lesson.

Etymology

ME f. LL responsorium (as RESPOND)