Trier \Tri"er\, n. [From Try.]

1. One who tries; one who makes experiments; one who examines anything by a test or standard. --Boyle.

2. One who tries judicially.

3. (Law) A person appointed according to law to try challenges of jurors; a trior. --Burrill.

4. That which tries or approves; a test. --Shak.

Source: Webster's Revised Unabridged Dictionary (1913)