deltiology

n.
The collection and study of postcards.

[From Greek deltion, diminutive of deltos, writing tablet, letter.]

(del-tee-OL-uh-jee)

noun
The study or collecting of postcards. [From Greek deltion, diminutive of deltos (writing tablet) + -logy.

Usage
"Floyd Jerdon is one of those people who would never confuse deltiology with scrutinizing college Greek week or studying deposits at the mouth of a river." — Barbara Dempsey; Postcards Send Him Back to Another Time; South Bend Tribune (Indiana); Feb 2, 2003. "(David) Brown, founder of the Institute of Deltiology, 300 W. Main Ave., has one of the largest postcard collections in North America." — Collector to Exhibit Postcards on Nov. 12; The Patriot-News (Harrisburg, Pennsylvania); Oct 31, 2002.

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the collecting of postcards