GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Gridiron , n. [OE. gredire, gredirne, from the same source as E. griddle, but the ending was confused with E. iron. See Griddle.]
   A grated iron utensil for broiling flesh and fish over coals.
   1913 Webster
   (Naut.) An openwork frame on which vessels are placed for examination, cleaning, and repairs.
   (Sport) A football field; -- so called because of the resemblance of the parallel marked yard lines to a gridiron{1}.
   PJC
   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