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The Collaborative International Dictionary
Epistolical

Epistolic \Ep`is*tol"ic\, Epistolical \Ep`is*tol"ic*al\, a. [L. epistolicus, Gr. ?.] Pertaining to letters or epistles; in the form or style of letters; epistolary.

Wiktionary
epistolical

a. (alternative form of epistolic English)