Main Entry: let·tre de ca·chet

Pronunciation: \ˈle-trə-də-ˌka-ˈshā\

Function: noun

Inflected Form(s): plural lettres de cachet \-trə(z)-\

Etymology: French, literally, letter with a seal

Date: 1718

: a letter bearing an official seal and usually authorizing imprisonment without trial of a named person