NOUN (4)

1. a harsh or humorous critic (sometimes intended as a facetious compliment);
- Example: "the honoree gave his roasters as good as he got"

2. a cook who roasts food;

3. flesh of a large young chicken over 3 1/2 lb suitable for roasting;

4. a special cooking pan for roasting;

The Collaborative International Dictionary of English v.0.48:

Roaster \Roast"er\, n.
   1. One who roasts meat.
      [1913 Webster]

   2. A contrivance for roasting.
      [1913 Webster]

   3. A pig, or other article of food fit for roasting.
      [1913 Webster]

WordNet (r) 3.0 (2006):

roaster
    n 1: a harsh or humorous critic (sometimes intended as a
         facetious compliment); "the honoree gave his roasters as
         good as he got"
    2: a cook who roasts food
    3: flesh of a large young chicken over 3 1/2 lb suitable for
       roasting
    4: a special cooking pan for roasting

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "roaster":
   Bantam, Cornish hen, banterer, banty, barn-door fowl,
   barnyard fowl, biddy, broiler, brooder, broody hen, caille, canard,
   caneton, capon, chaffer, chanticleer, chapon, chick, chickabiddy,
   chicken, chicky, cock, cockerel, dindon, domestic fowl, drake,
   duck, duckling, dunghill fowl, faisan, fowl, fryer, game fowl,
   gander, gobbler, goose, gosling, grouse, guinea cock, guinea fowl,
   guinea hen, hen, hen turkey, hot day, jollyer, josher, kidder, oie,
   partlet, partridge, persifleur, pheasant, pigeon, pigeonneau,
   poulard, poulet, poult, poultry, pullet, quail, ragger, ribber,
   rooster, scorcher, setting hen, sizzler, spring chicken, squab,
   stewing chicken, summer day, tom, tom turkey, turkey,
   turkey gobbler, turkey-cock, twitter, volaille, wild duck