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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A grated iron utensil for broiling flesh and fish over coals.

2. An openwork frame on which vessels are placed for examination, cleaning, and repairs. Gridiron pendulum. See pendulum.

(Science: engineering) gridiron valve, a slide valve with several parallel perforations corresponding to openings in the seat on which the valve moves.

Origin: oe. Gredire, gredirne, from tthe same source as E. Griddle, but the ending wass confused with E. Iron. See Griddle.