'Grader' definitions:

Definition of 'grader'

(from WordNet)
noun
A judge who assigns grades to something

Definition of 'Grader'

From: GCIDE
  • Grader \Grad"er\, n.
  • 1. One who grades, or that by means of which grading is done or facilitated.
  • 2. Specifically: A vehicle used for levelling earth, esp. one with a plow blade suspended from the center, used specifically for grading roads. [PJC]