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The Collaborative International Dictionary
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.

Wiktionary
probator

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.