Definition of Sacramentarian:

part of speech: adjective

Pert. to the sacraments.

part of speech: noun

One who differs from the Church of Rome in regard to the sacraments.

Usage examples:

• Here follows the American Evangelical: I still hope you will see your way clear to modify the present draft of the proposed Confirmation Office, as it gives a much higher Sacramentarian idea of it than the present, a concession which will greatly please the Sacerdotalists, to which they are by no means entitled. William Reed Huntington in "A Short History of the Book of Common Prayer".