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1. an official seal on a document, letter, etc.
2. Philately
a. a mark stamped by hand on mail for commemorative purposes
b. a small mark made by dealers and experts on the back of postage stamps
3. a hollow wafer, formerly used for enclosing an unpleasant-tasting medicine
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a capsule for taking medicinal powders that have an unpleasant taste. Cachets are made in factories from dough obtained by mixing starch and starch paste.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Most folk don't know what a cachet machine is, but they do know what a cachet is.
Historical review and tentative listing of cachets, hand stamp markings, wax seals, wafer seals and manuscript certifications alphabetically arranged according to countries.
Adjoining the museum is a turn-of-the-century general store where you can purchase first day covers with cachets by Fleetwood, the company that runs the museum.