D defs.my
Entry 2 senses Webster, 1913

Grader

/grād'-ẽr/ · Grad·er · IPA /ˈɡɹeɪdɚ/
01 n. One who grades, or that by means of which grading is done or facilitated.
  1. 1.
    One who grades, or that by means of which grading is done or facilitated.
  2. 2.
    A vehicle used for levelling earth, esp. one with a plow blade suspended from the center, used specifically for grading roads.