epistle
noun [ C ] uk/ɪˈpɪs.əl/ us/ɪˈpɪs.əl/
formal书信
a letter
humorous Many thanks for your lengthy epistle, which arrived in this morning's post. 今晨收到你写来的长信，非常感谢。
Synonyms: communication dispatch message (INFORMATION)missive
使徒书信
one of the letters written to the early Christians by the apostles (= the first men who believed in Jesus Christ)