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

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "pullet":
   Bantam, banty, barn-door fowl, barnyard fowl, biddy, birdling,
   broiler, brooder, broody hen, calf, capon, catling, chanticleer,
   chick, chickabiddy, chicken, chickling, chicky, cock, cockerel,
   colt, cub, dogie, domestic fowl, drake, duck, duckling,
   dunghill fowl, fawn, fledgling, foal, fowl, fryer, game fowl,
   gander, gobbler, goose, gosling, guinea cock, guinea fowl,
   guinea hen, hen, hen turkey, kid, kit, kitten, lamb, lambkin,
   litter, nest, nestling, partlet, piglet, pigling, polliwog,
   poulard, poult, poultry, pup, puppy, roaster, rooster, setting hen,
   shoat, spring chicken, stewing chicken, tadpole, tom, tom turkey,
   turkey, turkey gobbler, turkey-cock, weaner, whelp, yeanling