IPA: /dɪsˈɜːrtəˌtɔːr/
KK: /dɪsˈɜːrtəˌtɔr/
A person who writes a long essay or thesis on a particular subject, usually for a doctoral degree.
The dissertator spent years researching to complete their thesis.
Dissertator → It is formed from "dissertare" (meaning to discuss or argue) and the suffix "-or" (meaning one who). The word "dissertator" refers to one who discusses or presents a formal argument, typically in an academic context.
Think of someone who is 'discussing' ('dissertare') formally — that's why a dissertator is someone who presents a formal argument.