IPA: //ˈɡrædʒueɪtər//
KK: /ˈgrædʒueɪtər/
A device or instrument used to spread a solution over a surface or to divide a line into equal parts, or a person who indicates or determines graduation.
The graduator was used to evenly distribute the salt solution across the surface.
Graduator → It is formed from "gradus" (meaning step or degree) and "-ator" (a suffix indicating a person who performs an action). The word "graduator" refers to a person who has completed a degree or step in their education, typically at a graduation ceremony.
Think of someone who has taken a significant 'step' ('gradus') in their education, and the '-ator' indicates that this person has achieved something important.