|1.||an official seal on a document, letter, etc|
|2.||a distinguishing mark; stamp|
|a. a mark stamped by hand on mail for commemorative purposes|
|b. overprint Compare surcharge a small mark made by dealers and experts on the back of postage stamps|
|5.||a hollow wafer, formerly used for enclosing an unpleasant-tasting medicine|
|[C17: from Old French, from cacher to hide]|
cachet ca·chet (kā-shā')
An edible wafer capsule used for enclosing an unpleasant-tasting drug.