Webster's English Dictionary

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grid

grid \'grid\ n [back-formation fr. gridiron] 1: GRATING  2a1: a perforated 
   or ridged metal plate used as a conductor in a storage ba ttery 2a2: an 
   electrode consisting of a mesh or a spiral of fine wire in an elect ron 
   tube 2b: a network of uniformly spaced horizontal and perpendicular lines 
   for lo cating points by means of coordinates 2c: GRIDIRON