written or expressed in the form of letters 书信的;用书信表达的;书信体的 an epistolary novel 书信体小说
Oxford Collocations DictionaryEpistolary is used with these nouns:- novel
Word Originmid 17th cent.: from French épistolaire or Latin epistolaris, from epistola, from Greek epistolē, from epistellein ‘send news’, from epi ‘upon, in addition’ + stellein ‘send’.