n. A tool used in trying, testing, or sampling.n. One who tries; one who examines, investigates, tests, or attempts; one who experiments.n. Specifically— In English history, a member of a committee appointed by the king, and charged with examining petitions, referring them to the courts, and reporting them to Parliament, if so required.n. Under the Commonwealth, an ecclesiastical commissioner appointed by the Parliament to examine the character and qualifications of ministers for institution and induction.n. One who tries judicially; a judge.n. In law, one appointed to decide whether a challenge to a juror is just. See trior.n. That which tries; a test.