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The collection and study of postcards.

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

del′ti·ol′o·gist n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


Someone who collects and studies postcards.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
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47 What is the particular interest of a deltiologist?
A deltiologist website reveals that collectors are interested in subjects as diverse as postcards of the Berlin Wall, frogs, books and even corkscrews.
Dennis, a photographer and deltiologist (postcard collector!) says as a child he remembers reading about the Bradley Viaduct as one of the Wonders of the North.
Postcard collectors - or deltiologists - all dream of finding originals depicting the Titanic.