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What is "gridiron valve"

The Collaborative International Dictionary
Gridiron valve

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.

  3. (Sport) A football field; -- so called because of the resemblance of the parallel marked yard lines to a gridiron[1].

    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.