The term CASK SLAT is composed of two words: cask and STAVE. Cask is a noun that refers to a large barrel or container, usually made of wood, used for storing liquids such as wine or beer. STAVE is a noun that refers to one of the thin strips of wood that make up the sides of a cask. Together, these two words form the term cask slat, which is used to refer to the wooden frame that holds the sides of a cask together.