ANTIPH'ONAL, ANTIPH'ONARY, noun [contrary, and sound, voice.] A service book, in the Catholic church, containing all the invitatories, responsories, collects, and whatever is said or sung in the choir, except the lessons; called also a responsary; compiled by Gregory the Great.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI