testifier

from WordNet (r) 3.0 (2006)
testifier
    n 1: a person who testifies or gives a deposition [syn:
         {testifier}, {deponent}, {deposer}]
from The Collaborative International Dictionary of English v.0.48
Testifier \Tes"ti*fi`er\, n.
   One who testifies; one who gives testimony, or bears witness
   to prove anything; a witness.
   [1913 Webster]
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