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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



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.

References in periodicals archive ?
New York's Times Square, located in the first time zone in the continental United States to reach midnight 2000, and also the location of the world's most famous New Year's celebration, will be commemorated on a dated, official cachet envelope.
After all the seals are completed, the cachets will be offered for sale to the public.
This report was created for strategic planners, international executives and import/export managers who are concerned with the market for bread, baked goods, pastry, cakes, biscuits, communion wafers, empty cachets for pharmaceutical use, sealing wafers, and rice paper.
La perquisition de son domicile a Bab Ezzouar a permis la saisie d'un lot important de faux papiers et de documents officiels dont une fausse carte professionnelle d'un cadre du gouvernement, des dossiers de demandes de logement et de postes de travail et des cachets administratifs.
At one time drugs instead of sherbet was put in cachets with the aid of a cachet machine.
The following descriptions of these cancellation marks are taken from illustrations of some early 19th-century cachets (Figure 4 [18]).
La fouille a permis de saisir 600 comprimes psychotropes de differentes marques, des ordonnances ainsi que deux cachets humides.