The Collaborative International Dictionary of English v.0.48:

Grated \Grat"ed\, a. [From 2d Grate.]
   Furnished with a grate or grating; as, grated windows.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]