a. and sb. [f. L. epistola, after antiquarian, etc.]

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  A.  adj. Addicted to or occupied in letter-writing.

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1838.  Jas. Grant, Sk. Lond., 7. The admirable tactics of these epistolarian impostors.

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  B.  sb. A letter-writer.

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1807.  Anna Porter, Hungar. Bro., ii. (1832), 27. I’ll maintain this sweet sermonising epistolarian to be a woman.

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