The Collaborative International Dictionary of English v.0.48:

Analyzer \An"a*ly`zer\, n.
   1. One who, or that which, analyzes.
      [1913 Webster]

   2. (Opt.) The part of a polariscope which receives the light
      after polarization, and exhibits its properties.
      [1913 Webster]

WordNet (r) 3.0 (2006):

analyzer
    n 1: an instrument that performs analyses [syn: analyzer,
         analyser]