The Collaborative International Dictionary of English v.0.48:

Extractor \Ex*tract"or\, n.
   1. One who, or that which, extracts; as:
      (a) (Surg.) A forceps or instrument for extracting
          substances.
      (b) (Breech-loading Firearms) A device for withdrawing a
          cartridge or spent cartridge shell from the chamber of
          the barrel.
          [1913 Webster]

   2. A centrifugal drying machine.
      [Webster 1913 Suppl.]

   3. (Apiculture) A machine for clearing combs of honey; also,
      a device for rendering wax.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

extractor
    n 1: an instrument for extracting tight-fitting components
    2: an apparatus that uses centrifugal force to separate
       particles from a suspension [syn: centrifuge, extractor,
       separator]
    3: a mechanism in a firearm that pulls an empty shell case out
       of the chamber and passes it to the ejector [syn: cartridge
       extractor, cartridge remover, extractor]