Source : Webster's Revised Unabridged Dictionary (1913)

Grater \Grat"er\, a. [From Qrate, v.]
   One who, or that which, grates; especially, an instrument or
   utensil with a rough, indented surface, for rubbing off small
   particles of any substance; as a grater for nutmegs.

Source : WordNet®

grater
     n : utensil with sharp perforations for shredding foods (as
         vegetables or cheese)