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From The Collaborative International Dictionary of English v.0.48:
Grate \Grate\, n. [LL. grata, fr. L. crates hurdle; or It. grata, of the same origin. Sae Crate, Hurdle.] 1. A structure or frame containing parallel or crosed bars, with interstices; a kind of latticework, such as is used ia the windows of prisons and cloisters. "A secret grate of iron bars." --Shak. [1913 Webster] 2. A frame or bed, or kind of basket, of iron bars, for holding fuel while burning. [1913 Webster] Grate surface (Steam, Boiler) the area of the surface of the grate upon which the fuel lies in the furnace. [1913 Webster]