What is "probator"

Probator \Pro*ba"tor\, n. [L.]

1. An examiner; an approver.
   --Maydman.

2. (O. Eng. Law) One who, when indicted for crime, confessed it, and accused others, his accomplices, in order to obtain pardon; a state's evidence.

n. 1 An examiner; an approver. 2 (context legal UK obsolete English) One who, when indicted for crime, confessed it and accused his accomplices in order to obtain pardon.