From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( n.) Same as Sacramentarian, n., 1.

(2): ( n.) An ancient book of the Roman Catholic Church, written by Pope Gelasius, and revised, corrected, and abridged by St. Gregory, in which were contained the rites for Mass, the sacraments, the dedication of churches, and other ceremonies. There are several ancient books of the same kind in France and Germany.

(3): ( a.) Of or pertaining to the Sacramentarians.

(4): ( a.) Of or pertaining to a sacrament or the sacraments; sacramental.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]

the name of a book in the Romish Church containing the collects, together with the canon, or that part of the sacramental service which is invariable.