Grate \Grate\, v. t. [imp. & p. p. {Grated}; p. pr. &. vb. n. {Grating}.] To furnish with grates; to protect with a grating or crossbars; as, to grate a window. Grated \Grat"ed\, a. [From 2d {Grate}.] Furnished with a grate or grating; as, grated windows.