The Collaborative International Dictionary of English v.0.48:

Appraiser \Ap*prais"er\, n. [See Appraise, Apprizer.]
   One who appraises; esp., a person appointed and sworn to
   estimate and fix the value of goods or estates.
   [1913 Webster]

WordNet (r) 3.0 (2006):

appraiser
    n 1: one who estimates officially the worth or value or quality
         of things [syn: appraiser, valuator]
    2: one who determines authenticity (as of works of art) or who
       guarantees validity [syn: appraiser, authenticator]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

APPRAISER, practice. A person appointed by competent authority to appraise
or value goods; as in case of the death of a person, an appraisement and
inventory must be made of the goods of which he died possessed, or was
entitled to. Appraisers are sometimes appointed to assess the damage done to
property, by some public work, or to estimate its value when taken for
public use.