IPA: /rɪˈsɜːrtʃər/
KK: /rɪˈsɜːrʧər/
A person who studies a subject in detail to discover new information or reach a new understanding.
The researcher published her findings in a scientific journal.
Researcher → It is formed from "re-" (meaning again) and "search" (from Old French *cerchier*, meaning to seek or look for) and "-er" (meaning a person who). The word "researcher" refers to a person who seeks or looks for information again or in depth.
Think of someone who is 'seeking' ('search') information 'again' ('re-') — that's why a researcher is someone who looks for knowledge repeatedly.