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Webster's Dictionary (1865)

Pro-bā'tor, n.

noun

n. [Lat., from probare, to try, examine, approve, prove; It. provatore, Sp. probador, Fr. probateur. See PROVE.]

  1. An examiner; an approver. Maundman.
  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.