Source : Webster's Revised Unabridged Dictionary (1913)

Gridiron \Grid"i`ron\, n. [OE. gredire, gredirne, from the same
   source as E. griddle, but the ending was confused with E.
   iron. See {Griddle}.]
   1. A grated iron utensil for broiling flesh and fish over
      coals.

   2. (Naut.) An openwork frame on which vessels are placed for
      examination, cleaning, and repairs.

Source : WordNet®

gridiron
     n 1: a cooking utensil of parallel metal bars; used to grill fish
          or meat [syn: {grid}]
     2: the playing field on which football is played [syn: {football
        field}]