epistles is a form of:

Epistle



noun
1.
(a letter, any of the letters in the New Testament, written by the Apostles) លិខិតឧទិស, សំបុត្រ, កាព្យ, អក្ខរា
ENGLISH MEANING
noun
1.
A writing directed or sent to a person or persons; a written communication; a letter; -- applied usually to formal, didactic, or elegant letters.
2.
One of the letters in the New Testament which were addressed to their Christian brethren by Apostles.
verb
1.
(TRANSITIVE) To write; to communicate in a letter or by writing.