Probator is a person who, after having been accused for treason, or other felony, confesses his guilt before pleading guilty or not guilty and accuses the persons who were his accomplices of the same crime, in order to obtain a pardon for himself. A probator is also called an approver.
The following is an example of a case law referring to probator:
The criminal who confesses is called the approver, or, in Latin, probator. [State v. Graham, 41 N.J.L. 15, 16 (N.J. 1879)].