The Collaborative International Dictionary of English v.0.48:

Fryer \Fry"er\, n.
   1. Something or someone that fries.
      [1913 Webster]

   2. A young chicken or other food item suitable to be cooked
      by frying.
      [PJC]

   3. A pot equipped with a removable basket, designed to be
      used for frying objects; -- also called deep fryer.
      [PJC]

WordNet (r) 3.0 (2006):

fryer
    n 1: flesh of a medium-sized young chicken suitable for frying
         [syn: fryer, frier, pullet]