CACHET

noun Etymology: French, from cacher Date: circa 1639 1. a seal used especially as a mark of official approval, an indication of approval carrying great prestige, 2. a characteristic feature or quality conferring prestige, prestige , a medicinal preparation for swallowing consisting of a case usually of rice-flour paste enclosing a medicine, 4. a design or inscription on an envelope to commemorate a postal or philatelic event, an advertisement forming part of a postage meter impression, a motto or slogan included in a postal cancellation