graduator

from The Century Dictionary.

• noun One who or that which graduates.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who determines or indicates graduation.
• noun An instrument for dividing any line, right or curve, into small, regular intervals.
• noun An apparatus for diffusing a solution, as brine or vinegar, over a large surface, for exposure to the air.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who determines or indicates graduation.
• noun An instrument for dividing any line, straight or curved, into smaller regular intervals.
• noun An apparatus for diffusing a solution, such as brine or vinegar, over a large surface, for exposure to the air.