What is Nisi Prius Roll?

Legal Definition
Eng. practice. A transcript of a case made from the plea roll, and includes the declaration, plea, replication, rejoinder, &c. and the issue. Eunom. Dial. 2, 28, 29, p. 110, 111. After the nisi prius roll is returned from the trial, it assumes the name of posted. (q. v.)
-- Bouviers Law Dictionary
Legal Definition
In practice. The roll or record containing the pleadings, issue, and jury process of an action, made up for use in the nisi prius court.
-- Black's Law Dictionary
Legal Definition
The record of the proceedings in the court in which a case was begun made up for the nisi prius court.
-- Ballentine's Law Dictionary