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A diarist is someone who a diary. The word is used especially when that diary is later published and other people read it — a famous diarist, a wartime diarist. An ordinary person jotting in a notebook is more often just “someone who keeps a diary.” Diarist sounds a little literary, a little formal. Though actually, some people now use it of blogs and online journals, stretching the old paper-book picture. The -ist ending means the person, never the book itself.
日記作者（尤指日後出版、供人閱讀的那種）
組成From diary + -ist (a person who does that thing).
同家族的字
- diarythe book this person writes
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
diaristnoun/ˈdaɪəɹɪst/
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Someone who keeps a diary.
- Two typical weeks (selected at random and separated by a long interval) are set out in the accompanying tables, and indicate the clear and concise method adopted by the diarist throughout his 42 working years.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。