形容詞 epistolary:

1. written in the form of or carried on by letters or correspondence
   同義詞：epistolatory

e.pis.to.lar.y

adj.（形容詞）
Of or associated with letters or the writing of letters.
書信的：與書信或書寫書信有關的
Being in the form of a letter:
書信體的：以書信形式的：
例句：
epistolary exchanges.
書信往來

Carried on by or composed of letters:
用書信進行的，書信體的：
例句：
an epistolary friendship.
通訊友誼

來源：
From Latin epistol3ris
源自 拉丁語 epistol3ris
from epistola [epistle] * see epistle
源自 epistola [書信] *參見 epistle