Source : Webster's Revised Unabridged Dictionary (1913)

Roaster \Roast"er\, n.
   1. One who roasts meat.

   2. A contrivance for roasting.

   3. A pig, or other article of food fit for roasting.

Source : WordNet®

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