IPA: /ˈmɛm.wɑːr.ɪst/
KK: /ˈmɛm.ɔɪr.ɪst/
A person who writes about their own life experiences in a book or story.
The memoirist shared her journey through difficult times in her latest book.
Memoirist → It is formed from "memoir" (from French *mémoire*, meaning memory or recollection) and "-ist" (meaning a person who practices or is concerned with). A memoirist is a person who writes about their memories or personal experiences.
Think of someone who writes about their 'memories' ('memoir') — the '-ist' indicates they are a person engaged in that activity.