epistolary
adjective /ɪˈpɪstələri/
/ɪˈpɪstəleri/
(formal)- written or expressed in the form of letters
- an epistolary novel
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’.