From The Collaborative International Dictionary of English v.0.48:

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
      [1913 Webster]

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

   3. (Sport) A football field; -- so called because of the
      resemblance of the parallel marked yard lines to a

   Gridiron pendulum. See under Pendulum.

   Gridiron valve (Steam Engine), a slide valve with several
      parallel perforations corresponding to openings in the
      seat on which the valve moves.
      [1913 Webster]
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