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.

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.