Source : Webster's Revised Unabridged Dictionary (1913)

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 : WordNet®

trier
     n 1: one (as a judge) who examines and settles a case
     2: one who tries [syn: {attempter}, {essayer}]