The Collaborative International Dictionary of English v.0.48:

Pullet \Pul"let\, n. [OE. polete, OF. polete, F. poulette, dim.
   of poule a hen, fr. L. pullus a young animal, a young fowl.
   See Foal, and cf. Poult, Poultry, Pool stake.]
   A young hen, or female of the domestic fowl.
   [1913 Webster]

   Pullet sperm, the treadle of an egg. [Obs.] --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pullet
    n 1: flesh of a medium-sized young chicken suitable for frying
         [syn: fryer, frier, pullet]
    2: young hen usually less than a year old