epistolic

• epistolical

From Latin epistolicus, from Ancient Greek ἐπιστολικός (epistolikós, “suited to or in the style of a letter”).

epistolic (comparative more epistolic, superlative most epistolic)

1. Relating to letters or epistles, or in the form or style of them

   Synonym: epistolary

• “epistolic”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.